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研究者データベース

詳細

大川　泰一郎OOKAWA Taiichiroオオカワ　タイイチロウ

■所属部署名農学研究院　生物生産科学部門
■職名教授
Last Updated :2025/01/22

業績情報

氏名・連絡先

  • 氏名

    オオカワ　タイイチロウ, 大川　泰一郎, OOKAWA Taiichiro

主たる所属・職名

  • 農学研究院　生物生産科学部門, 教授

その他の所属

  • 農学部　生物生産学科
  • 農学府　生物生産科学専攻
  • グローバルイノベーション研究院

学歴

  • 東京農工大学
    農学部
    農学科
    至 1987年, 卒業
  • 東京農工大学
    農学研究科
    至 1989年, 修了, 修士

学位

  • 農学修士
  • 博士(農学)

教育・研究活動状況

  • イネをはじめとする主要な作物は、人類が栽培をはじめて以来、遺伝的な改良と栽培技術の改良が繰り返され、２０世紀には飛躍的に生産性は向上してきました。しかしながら、２１世紀の世界では深刻な食料不足に陥る可能性が指摘されており、世界の食料生産を高める重要な使命があります。自給率の低い日本では今後さらに、自給率を高めていく必要があります。作物の生産量を高めるためには、単位土地面積当たりの生産量を飛躍的に向上させることが鍵となっていますが、作物の生産能力を高めるためには、どのような性質を備える必要があるのでしょうか？ 植物は、葉で光を受け二酸化炭素を吸収して光合成を行います。作物は個体群として栽培されますので、光を受けやすく二酸化炭素が供給されやすい個体群構造を備えることが重要です。また、１枚１枚の葉の光合成能力が高く、葉が老化する過程で高い光合成能力をできるだけ長く維持すること、できるだけ多くの光合成産物を高い割合で効率的に葉から収穫部分に送り込むことも重要な性質です。現在、バイオマス生産、子実収量の高い作物品種の備えるべき生態生理学的性質の解明、高バイオマス作物に不可欠な倒伏抵抗性に関与する性質の解析を行い、その結果明らかになった重要な性質の遺伝解析を行い、品種改良に貢献する研究を行っています。その成果の一つに、茎を強くし倒れにくくする研究を行い、農研機構作物研究所と共同で、背が高く茎葉部バイオマス生産量が多く、倒伏抵抗性の極めて大きい飼料用水稲品種「リーフスター」を育成しました。リーフスターのような品種は飼料用だけでなく、バイオマスエネルギー用の品種としても利用できます。世界の食料不足の解決、日本の食料自給率、エネルギー自給率の向上を目標に、さらに研究を進めていきます。

研究分野

  • A389　環境・農学, A39020　作物生産科学

研究テーマ

  • 水稲の耐倒伏性に関する生理学的、遺伝学的研究
    自 2001
  • 高収量・高バイオマスイネの開発のための高バイオマス、強稈性遺伝子座の生理機能に関する研究
    自 200904
  • 多収性水稲品種の生理生態学的研究
    自 9999
  • 水稲の葉の光合成活性の維持に関する研究
    自 9999

共同・受託研究希望テーマ

  • 高バイオマス飼料用水稲の乾物生産特性、耐倒伏性に関する生理生態、遺伝学的研究
    産学連携等、民間を含む他機関等との共同研究を希望

科学研究費助成事業

  • 挑戦的研究（開拓）
    持続的農業システムのための食料生産プロセス工学の開拓
    自 2020年, 至 2020年
  • 基盤研究(B)
    スーパー台風に強いイネの多収・強稈遺伝子集積の発現機構と最適組合せの解明
    自 2019年, 至 2021年
  • 挑戦的研究（開拓）
    持続的農業システムのための食料生産プロセス工学の開拓
    自 2019年, 至 2019年
  • 基盤研究(B)
    極長稈イネの耐倒伏性強化に向けた深根性および強稈性遺伝子の解析
    自 2018年, 至 2018年
  • 基盤研究(B)
    極長稈イネの耐倒伏性強化に向けた深根性および強稈性遺伝子の解析
    自 2017年, 至 2017年
  • 基盤研究(A)
    直播水稲の収量ポテンシャル向上に関わる遺伝子座の作用機構と集積効果の統合的解明
    自 2017年, 至 2017年
  • 基盤研究（B）
    極長稈イネの耐倒伏性強化に向けた深根性および強稈性遺伝子の解析
    自 2016年, 至 2016年
  • 基盤研究(A)
    直播水稲の収量ポテンシャル向上に関わる遺伝子座の作用機構と集積効果の統合的解明
    自 2016年, 至 2016年
  • 基盤研究(B)
    台風に強い多収イネ品種開発のための強稈・多収遺伝子の集積効果とその発現機構の解明
    自 2015年, 至 2017年
  • 基盤研究(A)
    直播水稲の収量ポテンシャル向上に関わる遺伝子座の作用機構と集積効果の統合的解明
    自 2015年, 至 2015年
  • 基盤研究（Ａ）
    直播水稲の収量ポテンシャル向上に関わる遺伝子座の作用機構と集積効果の統合的解明
    自 2014年, 至 2014年
  • 挑戦的萌芽研究
    倒伏抵抗性極強の水稲品種開発のための極強稈性の生理機構の解明
    自 2013年, 至 2014年
  • 基盤研究(A)
    直播水稲の収量ポテンシャル向上に関わる遺伝子座の作用機構と集積効果の統合的解明
    自 2013年, 至 2013年
  • 基盤研究(B)
    倒伏に強い水稲多収品種開発のための強稈・多収遺伝子の生理機能の解明
    自 2012年, 至 2014年
  • 基盤研究(B)
    オオムギの耐塩性に関わる生理機構と遺伝子座の統合的解明
    自 2012年, 至 2012年
  • 挑戦的萌芽研究
    飼料・バイオ燃料兼用イネ品種開発のための強稈性と消化性・糖化性関連形質の解明
    自 2011年, 至 2012年
  • 基盤研究(B)
    オオムギの耐塩性に関わる生理機構と遺伝子座の統合的解明
    自 2011年, 至 2011年
  • 基盤研究(B)
    オオムギの耐塩性に関わる生理機構と遺伝子座の統合的解明
    自 2010年, 至 2010年
  • 基盤研究(B)一般
    高収量・高バイオマスイネ開発のための強稈性遺伝子座の生理機能の解明
    自 2009年, 至 2011年
  • 基盤研究(B)
    イネの吸収能力に関わる遺伝子座とその機能の解明
    自 2009年, 至 2009年
  • 萌芽研究
    多収性水稲のソース活性、シンク形成を高めるサイトカイニン関連遺伝子の解明
    自 2008年, 至 2009年
  • 基盤研究(B)
    イネの吸収能力に関わる遺伝子座とその機能の解明
    自 2008年, 至 2008年
  • 基盤研究(B)(2)一般
    作物の葉の光合成活性に影響する個体全体の窒素分配および酵素代謝ネットワークの解析
    自 2004年, 至 2006年
  • 基盤研究(B)一般
    作物の葉の光合成活性に影響する個体全体の窒素分配および窒素代謝ネットワークの解析
    自 2004年, 至 2006年
  • 基盤研究(B)一般
    作物の根の養水分吸収能力、耐塩性の簡易評価法の開発
    自 2002年, 至 2004年
  • 基盤研究(B)一般
    水ストレスが老化過程の葉の光合成速度に及ぼす影響の分子機構
    自 2002年, 至 2004年
  • 萌芽研究
    作物の根端組織が水分センサーとして根の伸長成長を制御する可能性とその機構
    自 2001年, 至 2001年
  • 若手研究(B)
    作物の葉の光合成過程における光合成速度、Rubisco含量の維持の生理的機構の解析
    自 2000年, 至 2001年
  • 基盤研究(B)一般
    水ストレス下での光合成制御に関わる葉と根のコミュニケーション機構
    自 1999年, 至 2001年

論文

  • Identification of Novel Quantitative Trait Loci for Culm Thickness of Rice Derived from Strong-Culm Landrace in Japan, Omachi
    Chigira, Koki; Yamasaki, Masanori; Adachi, Shunsuke; Nagano, Atsushi J.; Ookawa, Taiichiro
    RICE
    SPRINGER
    Increasing the lodging resistance of rice through genetic improvement has been an important target in breeding. To further enhance the lodging resistance of high-yielding rice varieties amidst climate change, it is necessary to not only shorten culms but strengthen them as well. A landrace rice variety, Omachi, which was established more than 100 years ago, has the largest culm diameter and bending moment at breaking in the basal internodes among 135 temperate japonica accessions. Using unused alleles in such a landrace is an effective way to strengthen the culm. In this study, we performed quantitative trait locus (QTL) analysis to identify the genetic factors of culm strength of Omachi using recombinant inbred lines (RILs) derived from a cross between Omachi and Koshihikari, a standard variety in Japan. We identified three QTLs for the culm diameter of the 5th internode on chromosomes 3 (qCD3) and 7 (qCD7-1, qCD7-2). Among them, qCD7-2 was verified by QTL analysis using the F-2 population derived from a cross between one of the RILs and Koshihikari. RNA-seq analysis of shoot apex raised 10 candidate genes underlying the region of qCD7-2. The increase in culm strength by accumulating Omachi alleles of qCD3, qCD7-1 and qCD7-2 was 25.0% in 2020. These QTLs for culm diameter pleiotropically increased spikelet number per panicle but did not affect days to heading or culm length. These results suggest that the Omachi alleles of qCD3, qCD7-1 and qCD7-2 are useful for breeding to increase lodging resistance and yield.
    2023年12月, 研究論文（学術雑誌）, 共同, 16, 1, 1939-8425, DOI(公開)(r-map)
  • Identification of Genomic Regions for Deep-Water Resistance in Rice for Efficient Weed Control with Reduced Herbicide Use
    Iwasa, Marina; Chigira, Koki; Nomura, Tomohiro; Adachi, Shunsuke; Asami, Hidenori; Nakamura, Tetsuya; Motobayashi, Takashi; Ookawa, Taiichiro
    RICE
    SPRINGER
    Deep-water (DW) management in rice fields is a promising technique for efficient control of paddy weeds with reduced herbicide use. Maintaining a water depth of 10-20 cm for several weeks can largely suppress the weed growth, though it also inhibits rice growth because the DW management is usually initiated immediately after transplanting. Improving the DW resistance of rice during the initial growth stage is essential to avoid suppressing growth. In this study, we demonstrate a large genetic variation in the above-ground biomass (AGB) after the end of DW management among 165 temperate japonica varieties developed in Japan. Because the AGB closely correlated with plant length (PL) and tiller number (TN) at the early growth stage, we analyzed genomic regions associated with PL and TN by conducting a genome-wide association study. For PL, a major peak was detected on chromosome 3 (qPL3), which includes a gene encoding gibberellin biosynthesis, OsGA20ox1. The rice varieties with increased PL had a higher expression level of OsGA20ox1 as reported previously. For TN, a major peak was detected on chromosome 4 (qTN4), which includes NAL1 gene associated with leaf morphological development and panicle number. Although there was less difference in the expression level of NAL1 between genotypes, our findings suggest that an amino acid substitution in the exon region is responsible for the phenotypic changes. We also found that the rice varieties having alternative alleles of qPL3 and qTN4 showed significantly higher AGB than the varieties with the reference alleles. Our results suggest that OsGA20ox1 and NAL1 are promising genes for improving DW resistance in rice.
    2023年12月, 研究論文（学術雑誌）, 共同, 16, 1, 1939-8425, DOI(公開)(r-map)
  • Physiological and morphological factors affecting leaf sheath reinforcement and their contribution to lodging resistance in rice
    Nomura, Tomohiro; Ohkubo, Satoshi; Nagano, Atsushi J.; Samadi, Ahmad Fahim; Adachi, Shunsuke; Ookawa, Taiichiro
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    In rice (Oryza sativa L.), leaf sheaths enhance stem strength and lodging resistance. However, little is known about the factors that affect varietal differences and changes over time regarding leaf sheath reinforcement. In the present study, the morphological and physiological traits that are presumed to be related to leaf sheath reinforcement were examined in 'Chugoku 117' and 'Koshihikari', rice varieties with high and low degrees of leaf sheath reinforcement, respectively. The results showed that Chugoku 117 had thicker leaf sheaths and delayed leaf sheath senescence than Koshihikari, indicating that there were clear varietal differences in these traits. The bending moment at breaking with leaf sheath was correlated with senescence-associated traits, especially strongly correlated with the number of living leaf sheaths in both varieties. Among the components examined in the present study, only starch content was significantly positively correlated with both varieties. On the other hand, the starch in the leaf sheath disappeared in the latter stage of ripening due to translocation to sinks, suggesting that it contributes to stem strength only up to the early stages of ripening. The findings suggest that rice stem strength can be increased by thickening the leaf sheaths and delaying leaf sheath senescence. Thus, in addition to the physical properties of the culm, such as shortening (semi-dwarfing) and strengthening, the findings of the present study provide a new breeding strategy for improving breaking-type lodging resistance in rice.
    2023年01月02日, 研究論文（学術雑誌）, 共同, 26, 1, 1343-943X, DOI(公開)(r-map), 48, 64
  • Alleles of high-yielding indica rice that improve root hydraulic conductance also increase flag leaf photosynthesis, biomass, and grain production of japonica rice in the paddy field
    Yamashita, Masahiro; Ootsuka, Chikako; Kubota, Hikaru; Adachi, Shunsuke; Yamaguchi, Takuya; Murata, Kazumasa; Yamamoto, Toshio; Ueda, Tadamasa; Ookawa, Taiichiro; Hirasawa, Tadashi
    FIELD CROPS RESEARCH
    ELSEVIER
    Improving net leaf photosynthetic rate (A(n)) by molecular breeding is an important research challenge in improving rice productivity. For the effective use of a locus or gene that increases A(n) in breeding, we must not only elucidate its roles in traits that increase A(n) but also evaluate its effects on phenology, leaf area, and canopy architecture and light-interception characteristics, all of which affect biomass and grain production. Alleles of the high-yielding indica rice cultivars 'Habataki' on chromosome (Chr.) 5 and 'Takanari' on Chr. 10 increase A(n) of rice with a japonica 'Koshihikari' genetic background. Here, we developed near isogenic lines (NILs) carrying these alleles (NIL5 and NIL10) and elucidated their performance in photosynthesis and in biomass and grain production in plants grown in the paddy field and pots. NIL5 and NIL10 had flag leaves with 12-13% higher A(n) than those of Koshihikari from full heading to ripening. Their higher An of the flag leaf was attributable to higher stomatal conductance (g(s)). NIL5 and NIL10 had a larger whole-plant hydraulic conductance than Koshihikari owing to the increased root surface area and root hydraulic conductance. NIL5 and NIL10 produced 6-10% more biomass at harvest and 8-14% higher grain yield than Koshihikari. Their crop growth rate was higher via higher net assimilation rate (NAR) during ripening. Heading date, ripening duration, biomass at booting (or heading), leaf area index, canopy architecture and canopy extinction coefficient at ripening and harvest index did not differ between Koshihikari and either NIL. Thus, the higher NAR and the consequent higher biomass and grain production in NIL5 and NIL10 were attributed to their increased flag leaf A(n). We conclude that both alleles are involved in improving root hydraulic conductance, which in turn increase flag leaf A(n), biomass and grain production, and they can be used in breeding high-yielding rice.
    2022年12月01日, 研究論文（学術雑誌）, 共同, 289, 0378-4290, DOI(公開)(r-map)
  • Metabolomic analysis of rice brittle culm mutants reveals each mutant- specific metabolic pattern in each organ
    Miyagi, Atsuko; Mori, Kazuhisa; Ishikawa, Toshiki; Ohkubo, Satoshi; Adachi, Shunsuke; Yamaguchi, Masatoshi; Ookawa, Taiichiro; Kotake, Toshihisa; Kawai-Yamada, Maki
    METABOLOMICS
    SPRINGER
    Introduction Plant cell walls play an important role in providing physical strength and defence against abiotic stress. Rice brittle culm (bc) mutants are a strength-decreased mutant because of abnormal cell walls, and it has been reported that the causative genes of bc mutants affect cell wall composition. However, the metabolic alterations in each organ of bc mutants have remained unknown. Objectives To evaluate the metabolic changes in rice bc mutants, comparative analysis of the primary metabolites was conducted. Methods The primary metabolites in leaves, internodes, and nodes of rice bc mutants and wild-type control were measured using CE- and LC-MS/MS. Multivariate analyses using metabolomic data was performed. Results We found that mutations in each bc mutant had different effects on metabolism. For example, higher oxalate content was observed in bc3 and bc1 bc3 mutants, suggesting that surplus carbon that was not used for cell wall components might be used for oxalate synthesis. In addition, common metabolic alterations such as a decrease of sugar nucleotides in nodes were found in bc1 and Bc6, in which the causative genes are involved in cellulose accumulation. Conclusion These results suggest that metabolic analysis of the bc mutants could elucidate the functions of causative gene and improve the cell wall components for livestock feed or bioethanol production.
    2022年11月19日, 研究論文（学術雑誌）, 共同, 18, 12, 1573-3882, DOI(公開)(r-map)
  • Effects of biochar and TUAT-1 bio-inoculant on grain yield and nitrogen efficiency of forage rice 'Monster rice 1' under different N application modes
    Win, Khin Thuzar; Okazaki, Keiki; Ookawa, Taiichiro; Yokoyama, Tadashi; Ohwaki, Yoshinari
    ARCHIVES OF AGRONOMY AND SOIL SCIENCE
    TAYLOR & FRANCIS LTD
    The application of bio-inoculant and biochar can be an effective strategy for stimulating crop growth, while improving soil fertility in an environmentally friendly manner. A greenhouse experiment was conducted to study the effects of biochar and TUAT-1 bio-inoculant under two N fertilization modes (basal and split) on the yield of forage rice and nutrient distribution in the soil rhizosphere. Positive effects of the biochar and bio-inoculant, either alone or in combination, on growth, photosynthesis rate, and yield components were depended on the mode of N application. There was no change in either microbial biomass carbon (MBC) or microbial biomass nitrogen (MBN) with the treatments of biochar and bio-inoculant with split N fertilization, whereas both these treatments, either alone or in combination, resulted in higher MBC and MBN with basal N fertilization. The NO3--N concentration of surface floodwater under biochar treatment was significantly reduced immediately after soil N fertilization, whereas biochar addition did not reduce the NH4+-N concentration of surface floodwater at each of our monitoring points. The findings indicate that biochar and the mode of N fertilization have the potential to improve forage rice productivity and soil nutrient availability, while minimizing the potential of nitrate (NO3--N) leaching.
    2022年11月10日, 研究論文（学術雑誌）, 共同, 68, 13, 0365-0340, DOI(公開)(r-map), 1769, 1783
  • Biofertilizer with Bacillus pumilus TUAT1 Spores Improves Growth, Productivity, and Lodging Resistance in Forage Rice
    Agake, Shin-ichiro; Ohwaki, Yoshinari; Kojima, Katsuhiro; Yoshikawa, Emon; Ramirez, Maria Daniela Artigas; Bellingrath-Kimura, Sonoko Dorothea; Yamada, Tetsuya; Ookawa, Taiichiro; Ohkama-Ohtsu, Naoko; Yokoyama, Tadashi
    AGRONOMY-BASEL
    MDPI
    Bacillus pumilus strain TUAT1 is a plant growth-promoting bacterium (PGPB) applied as a biofertilizer, containing its spores, for rice. In this study, we analyzed the short-term effects of biofertilization on plant growth in the nursery and long-term effects on plant vegetative growth, yield, and lodging resistance in paddy fields using animal feed rice ('Fukuhibiki' and line LTAT-29 which was recently officially registered as a cultivar 'Monster Nokodai 1') and fodder rice (line TAT-26). The effects of the biofertilization were analyzed under two nitrogen treatments and at two transplanting distances in the field. The application of 10(7) colony forming units (CFU) mL(-1) bacterial spore solution to seeds on plant box significantly improved the initial growth of rice. The biofertilizer treatment with this strain at 10(7 )CFU g(-1) onto seeds in nursery boxes increased the nitrogen uptake at the early growth of rice in the field, resulting in higher growth at the late vegetative growth stage (e.g., tiller number and plant height). Furthermore, the improvement of growth led to increases of not only yield components such as the total panicle number (TPN) and the number of spikelets in a panicle (NSP) in LTAT-29 but also the straw yield and quality of TAT-26. The lodging resistances of these forage rice plants were also improved due to the increased root development and photosynthesis creating tougher culms.
    2022年10月, 研究論文（学術雑誌）, 共同, 12, 10, DOI(公開)(r-map)
  • Pyramiding of multiple strong-culm genes originating from indica and tropical japonica to the temperate japonica rice
    Ookawa, Taiichiro; Nomura, Tomohiro; Kamahora, Eri; Jiang, Mingjin; Ochiai, Yusuke; Samadi, Ahmad Fahim; Yamaguchi, Takuya; Adachi, Shunsuke; Katsura, Keisuke; Motobayashi, Takashi
    SCIENTIFIC REPORTS
    NATURE PORTFOLIO
    Severe lodging has recurrently occurred at strong typhoon's hitting in recent climate change. The identification of quantitative trait loci and their responsible genes associated with a strong culm and their pyramiding are important for developing high-yielding varieties with a superior lodging resistance. To evaluate the effects of four strong-culm genes on lodging resistance, the temperate japonica near isogenic line (NIL) with the introgressed SCM1 or SCM2 locus of the indica variety, Habataki and the other NIL with the introgeressed SCM3 or SCM4 locus of the tropical japonica variety, Chugoku 117 were developed. Then, we developed the pyramiding lines with double,triple and quadruple combinations derived from step-by-step crosses among NIL-SCM1-NIL-SCM4. Quadruple pyramiding line (NIL-SCM1 + 2 + 3 + 4) showed the largest culm diameter and the highest culm strength among the combinations and increased spikelet number due to the pleiotropic effects of these genes. Pyramiding of strong culm genes resulted in much increased culm thickness, culm strength and spikelet number due to their additive effect. SCM1 mainly contributed to enhance their pyramiding effect. These results in this study suggest the importance of identifying the combinations of superior alleles of strong culm genes among natural variation and pyramiding these genes for improving high-yielding varieties with a superior lodging resistance.
    2022年09月13日, 研究論文（学術雑誌）, 共同, 12, 1, 2045-2322, DOI(公開)(r-map)
  • Potential of rice landraces with strong culms as genetic resources for improving lodging resistance against super typhoons
    Nomura, Tomohiro; Seki, Yoshiaki; Matsuoka, Makoto; Yano, Kenji; Chigira, Koki; Adachi, Shunsuke; Pinera-Chavez, Francisco J.; Reynolds, Matthew; Ohkubo, Satoshi; Ookawa, Taiichiro
    Scientific Reports
    NATURE PORTFOLIO
    It is generally believed that rice landraces with long culms are susceptible to lodging, and have not been utilized for breeding to improve lodging resistance. However, little is known about the structural culm strength of landraces and their beneficial genetic loci. Therefore, in this study, genome-wide association studies (GWAS) were performed using a rice population panel including Japanese rice landraces to identify beneficial loci associated with strong culms. As a result, the landraces were found to have higher structural culm strength and greater diversity than the breeding varieties. Genetic loci associated with strong culms were identified, and it was demonstrated that haplotypes with positive effects of those loci were present in a high proportion of these landraces. These results indicated that the utilization of the strong culm-associated loci present in Japanese rice landraces may further improve the lodging resistance of modern breeding varieties that have relied on semi-dwarfism.
    2021年08月04日, 研究論文（学術雑誌）, 共同, 11, 11, DOI(公開)(r-map)
  • Seed coating by biofertilizer containing spores of Bacillus pumilus TUAT1 strain enhanced initial growth of Oryza sativa L.
    Agake, Shin-ichiro; Ramirez, Maria Daniela Artigas; Kojima, Katsuhiro; Ookawa, Taiichiro; Ohkama-Ohtsu, Naoko; Yokoyama, Tadashi
    AGRONOMY JOURNAL
    WILEY
    In rice production, early growth is often slow in direct-seeded system. Techniques to overcome this barrier are needed. This study evaluated the effectiveness of Kikuichi-a biofertilizer containing Bacillus pumilus TUAT1 spore-in promoting rice growth in a direct-sowing system. Oxygen, iron, and molybdenum as coating materials were also evaluated to combine with biofertilizer. The seeds were coated with powdered Kikuichi with polyvinyl alcohol followed by a coating with calcium peroxide (CALPER), molybdenum (Benmoly), and iron powder. Double coating with the biofertilizer and Benmoly promoted plant growth. We applied amounts of Kikuichi equivalent to one, two and a half, and five times the weight of the seeds and found that the growth-promoting effect was dependent on the amount applied. The best timing of application of the coating, specifically during sprouting, was before the coleoptile emerged. Bacillus pumilus TUAT1 can enhance the growth of rice when it exists in high concentration on the spermosphere by coating with molybdenum, but double coating with neither calcium peroxide nor iron powder contributed to the initial growth of the seeds. Kikuichi coating with Benmoly has positive effects on the rice growth. This coating method is suitable to apply biofertilizer for direct sowing cultivation of rice.
    2021年07月, 研究論文（学術雑誌）, 共同, 113, 4, DOI(公開)(r-map)
  • Maintaining higher leaf photosynthesis after heading stage could promote biomass accumulation in rice
    Honda, Sotaro; Ohkubo, Satoshi; San, Nan Su; Nakkasame, Anothai; Tomisawa, Kazuki; Katsura, Keisuke; Ookawa, Taiichiro; Nagano, Atsushi J.; Adachi, Shunsuke
    SCIENTIFIC REPORTS
    NATURE PORTFOLIO
    Leaf photosynthetic rate changes across the growing season as crop plants age. Most studies of leaf photosynthesis focus on a specific growth stage, leaving the question of which pattern of photosynthetic dynamics maximizes crop productivity unanswered. Here we obtained high-frequency data of canopy leaf CO2 assimilation rate (A) of two elite rice (Oryza sativa) cultivars and 76 inbred lines across the whole growing season. The integrated A value after heading was positively associated with crop growth rate (CGR) from heading to harvest, but that before heading was not. A curve-smoothing analysis of A after heading showed that accumulated A at>80% of its maximum (A(80)) was positively correlated with CGR in analyses of all lines mixed and of lines grouped by genetic background, while the maximum A and accumulated A at <= 80% were less strongly correlated with CGR. We also found a genomic region (similar to 12.2 Mb) that may enhance both A(80) and aboveground biomass at harvest. We propose that maintaining a high A after heading, rather than having high maximum A, is a potential target for enhancing rice biomass accumulation.
    2021年04月07日, 研究論文（学術雑誌）, 共同, 11, 1, DOI(公開)(r-map)
  • Accession difference in leaf photosynthesis, root hydraulic conductance and gene expression of root aquaporins under salt stress in barley seedlings
    Kodama, Asuka; Watanabe, Tamaki; Yamaguchi, Makoto; Narita, Ryohei; Katsuhara, Maki; Sato, Kazuhiro; Ookawa, Taiichiro; Hirasawa, Tadashi
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    Soil salinity causes considerable losses of crop productivity. Barley (Hordeum vulgare) is one of the most salt-tolerant Gramineae crops. Previously, we found that net photosynthetic rate (A(n)) was kept remarkably higher in the salt-tolerant barley accession OUE812 than in the salt-sensitive accession OUC613 after heading under salt stress due to the low level of salt accumulation in leaves. Here we grew seedlings in Hoagland solution with 100 mM NaCl (salt treatment) or without added NaCl (control), and comparedA(n), stomatal conductance (g(s)), salt accumulation in leaves, root hydraulic conductance and gene expression of root aquaporins between the accessions under salt stress for a few days.A(n),g(s)and root hydraulic conductance of the plants with salt treatment decreased significantly in OUC613 compared to OUE812 with no accession difference in salt accumulation in leaves at 2 days after the onset of treatment (DAT). The reduction in root hydraulic conductance in OUC613 was caused by the reduction of the root hydraulic conductivity (Lp(r)). Salt treatment also decreased the transcript levels of some plasma membrane intrinsic aquaporin genes (HvPIPs) in OUC613 and, on the contrary, increased those of someHvPIPs in OUE812, resulting in a large difference between OUC613 and OUE812 in the transcript levels at 2 DAT. The accession difference inHvPIPs expression and thusLp(r)was closely associated with the accession difference inA(n)andg(s)under the short-term salt stress.
    2021年01月02日, 研究論文（学術雑誌）, 共同, 24, 1, 1343-943X, DOI(公開)(r-map), 73, 82
  • Quantitative trait loci for leaf inclination angle in rice detected using reciprocal mapping populations
    San, Nan Su; Soda, Kazuya; Ootsuki, Yosuke; Yamashita, Masahiro; Karimata, Ryoji; Suzuki, Kasumi; Adachi, Shunsuke; Yamamoto, Toshio; Tanabata, Takanari; Ueda, Tadamasa; Ookawa, Taiichiro; Hirasawa, Tadashi
    FIELD CROPS RESEARCH
    ELSEVIER
    The improvement of canopy architecture is a feasible way to increase rice productivity. However, its genetic control in rice cultivars in the field is not well understood. The high-yielding indica cultivar Takanari has more erect leaves (a larger leaf inclination angle: LIA) during ripening, and this contributes to its higher dry matter production than that of the widely grown but less productive japonica cultivar Koshihikari. To identify quantitative trait loci (QTLs) for increasing LIA, we used reciprocal mapping populations of backcross inbred lines (131 lines in 2009 and 143 lines in 2010) and chromosome segment substitution lines (80 lines in 2011 and 2012) derived from a cross between Takanari and Koshihikari. Six Takanari alleles increased LIA at least in two of the four years, but we could not detect any such Koshihikari alleles. Five QTLs for LIA were expressed in plants with both Koshihikari and Takanari genetic backgrounds. LIA of two near isogenic lines carrying only one Takanari allele reached the level of Takanari. The Takanari alleles of the QTLs decreased the length of parenchyma cells in the lamina joint on the adaxial side in plants with the Koshihikari background, decreasing the ratio of the lamina joint length on the adaxial side to that on the abaxial side (LJ ratio) and thus increasing LIA. Three Takanari alleles increased dry matter production in plants with Koshihikari background via decreasing the canopy extinction coefficient (k). However, any pyramiding effects of Takanari alleles on LJ ratio, LIA, k and dry matter production were not observed.
    2021年01月01日, 研究論文（学術雑誌）, 共同, 266, DOI(公開)(r-map)
  • Landraces of temperate japonica rice have superior alleles for improving culm strength associated with lodging resistance
    Chigira, Koki; Kojima, Natsuko; Yamasaki, Masanori; Yano, Kenji; Adachi, Shunsuke; Nomura, Tomohiro; Jiang, Mingjin; Katsura, Keisuke; Ookawa, Taiichiro
    SCIENTIFIC REPORTS
    NATURE RESEARCH
    Lodging can reduce grain yield and quality in cereal crops including rice (Oryza sativa L.). To achieve both high biomass production and lodging resistance, the breeding of new cultivars with strong culms is a promising strategy. However, little is known about the diversity of culm strength in temperate japonica rice and underlying genetic factors. Here, we report a wide variation of culm strength among 135 temperate japonica cultivars, and some landraces having the strongest culms among these cultivars. The genome-wide association study (GWAS) identified 55 quantitative trait loci for culm strength and morphological traits, and revealed several candidate genes. The superior allele of candidate gene for culm thickness, OsRLCK191, was found in many landraces but had not inherited to the modern improved cultivars. Our results suggest that landraces of temperate japonica rice have unutilized superior alleles for contributing future improvements of culm strength and lodging resistance.
    2020年11月16日, 研究論文（学術雑誌）, 共同, 10, 1, 2045-2322, DOI(公開)(r-map)
  • The effects of seeding rate on yield, lodging resistance and culm strength in wheat
    Matsuyama, Hiromi; Ookawa, Taiichiro
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    We compared the effects of four seeding rates, 60, 100, 140, and 180 seeds m(-2), on yield, lodging resistance and culm strength using two Japanese wheat cultivars Ayahikari and Iwainodaichi. With the decreasing seeding rate, maximum tiller number decreased, percentage of productive culms increased and spike number m(-2) decreased, and the spikelet number per spike, percentage of fertile spikelets, grain number per spikelet and grain number per spike increased. Consequently, grain yield was not significantly affected. Lodging was not observed, but the lodging index was significantly affected by the seeding rate and was the highest in the plots sown at 180 seeds m(-2). The bending moment at the breaking point and flexural rigidity of the basal internode with leaf sheaths were highest in the plots sown at 60 seeds m(-2). In conclusion, the culm strength and stem lodging resistance increased with decreasing seeding rate. Section modulus and bending stress, which constitute the bending moment at the breaking point, and the moment of inertia area and Young's modulus, which represent the flexural rigidity, were highest in plots sown at 60 seeds m(-2). Therefore, the seeding rate was considered to influence the culm morphology and functions of the cell wall components. The effects of the seeding rate on culm characteristics and lodging resistance did not differ between the two cultivars, and 'Ayahikari' had consistently stronger culms than 'Iwainodaichi'. We suggest that low seeding rates method would be suitable for heavily fertilized cultivation for both cultivar with high and low culm strength.
    2020年07月02日, 研究論文（学術雑誌）, 共同, 23, 3, 1343-943X, DOI(公開)(r-map), 322, 332
  • Semi-dwarf 1 (sd1) gene enhances light penetration into the canopy through regulating leaf inclination angle in rice
    San, Nan Su; Suzuki, Kasumi; Soda, Kazuya; Adachi, Shunsuke; Kasahara, Hiroyuki; Yamamoto, Toshio; Ikka, Takashi; Kondo, Katsuhiko; Yamanouchi, Utako; Sugimoto, Kazuhiko; Nagamura, Yoshiaki; Hirasawa, Tadashi; Ookawa, Taiichiro
    FIELD CROPS RESEARCH
    ELSEVIER
    Manipulating leaf inclination angle is a feasible approach to improve canopy photosynthesis and dry matter production in rice (Oryza sativa) via enhancing light penetration into the canopy. The importance of the semi-dwarf 1 (sd1) gene, a loss-of-function allele of SD1 encoding GA-20 oxidase-2 in gibberellin (GA) biosynthesis, in rice yield through improving lodging resistance is well known. However, little is known about the effects of sd1 as well as GA on leaf inclination angle. A near-isogenic line carrying the 'Takanari' sd1 allele in the 'Koshihikari' genetic background (NIL-sd1) had leaves with larger (more erect) leaf inclination angle and showed a smaller canopy extinction coefficient at the ripening stage than did 'Koshihikari'. Furthermore, the leaf inclination angle of 'Reimei', an sd1 mutant in the 'Fujiminori' background, and of several other sd1 mutants in 'Koshihikari' background, was larger at the ripening stage than in parental lines, NULLFujiminori' and 'Koshihikari', respectively. The flag leaves of 'Koshihikari' plants treated with a GA biosynthesis inhibitor, paclobutrazol (PBZ), displayed a larger leaf inclination angle than did those of mock-treated plants during ripening. Treatment at the lamina joint of a flag leaf with exogenous GA(3) or brassinolide (BL) significantly decreased leaf inclination angle. BL treatment increased the thickness of lamina joint tissue and the longitudinal cell length on the adaxial side of the marginal region of lamina joint, whereas GA(3) treatment only increased the longitudinal cell length. NIL-sd1 had a lamina joint with decreased longitudinal adaxial cell length, but no difference in abaxial cell length nor tissue thickness in lamina joint cross section compared with that of 'Koshihikari'. Thus, sd1 regulates the leaf inclination angle via a GA-based mechanism but not via BL involved in the crosstalk with GA.
    2020年02月01日, 研究論文（学術雑誌）, 共同, 246, 0378-4290, DOI(公開)(r-map)
  • Genetic architecture of leaf photosynthesis in rice revealed by different types of reciprocal mapping populations
    Adachi, Shunsuke; Yamamoto, Toshio; Nakae, Toru; Yamashita, Masahiro; Uchida, Masaki; Karimata, Ryoji; Ichihara, Naoto; Soda, Kazuya; Ochiai, Takayuki; Ao, Risako; Otsuka, Chikako; Nakano, Ruri; Takai, Toshiyuki; Ikka, Takashi; Kondou, Katsuhiko; Ueda, Tadamasa; Ookawa, Taiichiro; Hirasawa, Tadashi
    JOURNAL OF EXPERIMENTAL BOTANY
    OXFORD UNIV PRESS
    The improvement of leaf net photosynthetic rate (A(n)) is a major challenge in enhancing crop productivity. However, the genetic control of A(n) among natural genetic accessions is still poorly understood. The high-yielding indica cultivar Takanari has the highest A(n) of all rice cultivars, 20-30% higher than that of the high-quality japonica cultivar Koshihikari. By using reciprocal backcross inbred lines and chromosome segment substitution lines derived from a cross between Takanari and Koshihikari, we identified three quantitative trait loci (QTLs) where the Takanari alleles enhanced A(n) in plants with a Koshihikari genetic background and five QTLs where the Koshihikari alleles enhanced A(n) in plants with a Takanari genetic background. Two QTLs were expressed in plants with both backgrounds (type I QTL). The expression of other QTLs depended strongly on genetic background (type II QTL). These beneficial alleles increased stomatal conductance, the initial slope of A(n) versus intercellular CO2 concentration, or A(n) at CO2 saturation. Pyramiding of these alleles consistently increased A(n). Some alleles positively affected biomass production and grain yield. These alleles associated with photosynthesis and yield can be a valuable tool in rice breeding programs via DNA marker-assisted selection.
    2019年10月01日, 研究論文（学術雑誌）, 共同, 70, 19, 0022-0957, DOI(公開)(r-map), 5131, 5144
  • Identification of quantitative trait loci for breaking and bending types lodging resistance in rice, using recombinant inbred lines derived from Koshihikari and a strong culm variety, Leaf Star
    Samadi, Ahmad Fahim; Suzuki, Hiroki; Ueda, Tadamasa; Yamamoto, Toshio; Adachi, Shunsuke; Ookawa, Taiichiro
    PLANT GROWTH REGULATION
    SPRINGER
    To develop rice varieties with increased biomass and grain yield, enhancing culm strength for superior lodging resistance is an essential trait. Leaf Star developed from a cross between Koshihikari and Chugoku 117 has a high bending stress despite its reduced lignin concentration owing to its high densities of hemicellulose, cellulose and low lignin density in the culm compared to Koshihikari, which shows superior resistance to lodging due to its combination of culm thickness and culm stiffness. However, the quantitative trait loci (QTLs) associated with these strong culm traits remain to be identified. Using 94 recombinant inbred lines (RILs) derived from a cross between Leaf Star and Koshihikari, a total of 12 QTLs on chromosome 1, 2, 3, 5, 10 and 11 were detected for breaking-type lodging resistance in F-7 and F-8 RILs. Further, a set of 12 QTLs affecting bending-type lodging resistance was detected in F-7 and F-8 on chr. 2, 3, 5, 10 and 11. QTLs for Section Modulus and Secondary Moment of Inertia on chr. 2 and 3 overlapped with QTLs associated with SCM3 on chr. 3 and SCM4 on chr. 2 from Chugoku 117 and Koshihikari. QTLs for starch and cell wall components such as cellulose and hemicellulose were detected on chr. 5 with Leaf Star allele's contributions. These findings suggest that the detected QTLs contribute to strengthening the cell wall and play a key role in the mechanical strength of the culm, which contributes to lodging resistance.
    2019年09月, 研究論文（学術雑誌）, 共同, 89, 1, 0167-6903, DOI(公開)(r-map), 83, 98
  • Next generation long-culm rice with superior lodging resistance and high grain yield, Monster Rice 1
    Nomura, Tomohiro; Arakawa, Naoya; Yamamoto, Toshio; Ueda, Tadamasa; Adachi, Shunsuke; Yonemaru, Jun-ichi; Abe, Akira; Takagi, Hiroki; Yokoyama, Tadashi; Ookawa, Taiichiro
    PLOS ONE
    PUBLIC LIBRARY SCIENCE
    During late 1960s Green Revolution, researchers utilized semidwarf 1 (sd1)to improve the yield and lodging resistance in rice (Oryza sativa L.). However, sd1 has a negative effect to culm strength and biomass production. To increase yield dramatically in 21th century, development of next generation long-culm rice for non-lodging and high grain yield independent of sd1 has been needed. The present study developed Monster Rice 1, a long-culm and heavy-panicle type of rice line and compared it with Takanari, a high-yielding semidwarf rice variety about yield and lodging resistance associated traits. Brown rice yield and bending moment at breaking of the basal elongated internode were higher in Monster Rice 1 than those in Takanari due to a large number of spikelets per panicle and thicker culm. Furthermore, to identify QTLs with superior alleles for these traits, QTL and haplotype analyses were performed using F-2 population and recombinant inbred lines derived from a cross between Monster Rice 1 and Takanari. The results from this study suggest that long-culm and heavy-panicle type of rice with a superior lodging resistance by culm strength can perform its high yield potential by using these identified QTLs contributing yield and lodging resistance.
    2019年08月22日, 研究論文（学術雑誌）, 共同, 14, 8, 1932-6203, DOI(公開)(r-map)
  • Influence of rice-husk biochar and Bacillus pumilus strain TUAT-1 on yield, biomass production, and nutrient uptake in two forage rice genotypes
    Win, Khin Thuzar; Okazaki, Keiki; Ookawa, Taiichiro; Yokoyama, Tadashi; Ohwaki, Yoshinari
    PLOS ONE
    PUBLIC LIBRARY SCIENCE
    Biochar is widely used as a soil amendment to increase crop yields. However, the impact of the interaction between the biochar and microbial inoculants (e.g., biofertilizer) on plant nutrient uptake and yield in forage rice is not fully understood. A greenhouse study was conducted to evaluate the synergistic effects of rice-husk biochar and Bacillus pumilus strain TUAT-1 biofertilizer application on growth, yield, and nutrient uptake in two forage rice genotypes; Fukuhibiki and the newly bred line, LTAT-29. Positive effects of biochar and biofertilizer, alone or in a combination, on growth traits, nutrient uptake, and yield components were dependent on the rice genotypes. Biochar and TUAT-1 biofertilizer influenced the overall growth of plants positively and increased straw and above-ground biomass in both genotypes. However, although biochar application significantly increased grain yield in LTAT-29, this was not the case in Fukuhibiki. Biochar and TUAT-1 biofertilizer, either alone or combined, significantly affected plant nutrient uptake but the effect largely depended on rice genotype. Results of this study indicate that biochar amendment and TUAT-1 biofertilizer can enhance forage rice productivity depending on genotypes, and therefore, there is a need to consider plant genetic composition when evaluating the potential for crop response to these soil amendments before application on a commercial scale.
    2019年07月31日, 研究論文（学術雑誌）, 共同, 14, 7, 1932-6203, DOI(公開)(r-map)
  • Evaluation of the effects of spores and their heat-treated residues from different Bacillus strains on the initial growth of rice plants
    Seerat, Ali Yawar; Ookawa, Taiichiro; Kojima, Katsuhiro; Ohkama-Ohtsu, Naoko; Maeda, Masumi; Djedidi, Salem; Habibi, Safiullah; Sekimoto, Hitoshi; Abe, Akira; Yokoyama, Tadashi
    SOIL SCIENCE AND PLANT NUTRITION
    TAYLOR & FRANCIS LTD
    This study evaluated the effects of the spores and their heat-treated residues from different strains of Bacillus species (B. pumilus, B. altitudinis, and B. megaterium) on the early growth of paddy rice cultivars, including Hitomebore (short-grain japonica rice), Takanari (high-yielding indica rice), and two new lines, TULK-143-6 and LTAT-29. The spores of seven Bacillus strains positively affected Hitomebore root growth, while, the root volume of TULK-143-6 with inoculation of B. pumilus TUAT1 and JM52, and root length and root surface area of LTAT-29 with inoculation of B. megaterium MAFF301694 were increased significantly. In contrast with Hitomebore, Takanari root growth was significantly inhibited by the spores of six Bacillus strains. Surprisingly, inoculations with the spore residues from all tested Bacillus strains increased the root dry weight of Hitomebore, with the effects of four bacterial strains being significant. Furthermore, there were more Bacillus spores than vegetative cells at different time points during the initial rice growth stage, and most plant samples mainly consisted of Bacillus spores. Thus, the spores of Bacillus species likely promote rice root development.
    2019年03月04日, 研究論文（学術雑誌）, 共同, 65, 2, 0038-0768, DOI(公開)(r-map), 122, 136
  • Mapping of QTLs associated with lodging resistance in rice (Oryza sativa L.) using the recombinant inbred lines derived from two high yielding cultivars, Tachisugata and Hokuriku 193
    Jiang, Mingjin; Yamamoto, Eiji; Yamamoto, Toshio; Matsubara, Kazuki; Kato, Hiroshi; Adachi, Shunsuke; Nomura, Tomohiro; Kamahora, Eri; Ma, Jun; Ookawa, Taiichiro
    PLANT GROWTH REGULATION
    SPRINGER
    Lodging is one of the major problems in rice production. In this study, we identified quantitative trait loci (QTLs) for lodging resistance traits using recombinant inbred lines (RILs) derived from a cross between two high yielding and superior lodging resistant rice cultivars, Tachisugata and Hokuriku 193. A total of 19 QTLs were detected on chromosomes (Chrs.) 2, 4, 6, 8, 9 and 10 in the F-6 and F-7 populations. In particular, one stable QTL for the section modulus (SM) and the outer diameter of the major axis (ODMA) was detected on Chr. 2 in both the F-6 and F-7 populations, and the positive allele was derived from Tachisugata. Correlation analysis showed that the SM and ODMA were positively correlated with the bending moment at breaking, the primary factor for the breaking type lodging resistance in rice. In addition, two QTLs for the spikelet number of the secondary branch and the spikelet number per panicle were also detected on Chr. 2, which overlapped with the stable QTL for the traits related to lodging resistance. These results indicated that the stable QTL might have combined effects on the traits associated with lodging resistance and grain yield. The novel QTL would be a promising target in marker-assisted selection to improve lodging resistance and grain yield in rice.
    2019年03月, 研究論文（学術雑誌）, 共同, 87, 2, 0167-6903, DOI(公開)(r-map), 267, 276
  • QTLs maintaining grain fertility under salt stress detected by exome QTL-seq and interval mapping in barley
    Kodama, Asuka; Narita, Ryouhei; Yamaguchi, Makoto; Hisano, Hiroshi; Adachi, Shunsuke; Takagi, Hiroki; Ookawa, Taiichiro; Sato, Kazuhiro; Hirasawa, Tadashi
    BREEDING SCIENCE
    JAPANESE SOC BREEDING
    Enhancing salt stress tolerance is a key strategy for increasing global food production. We previously found that long-term salinity stress significantly reduced grain fertility in the salt-sensitive barley (Hordeum vulgare) accession, NULLOUC613', but not in the salt-tolerant accession, NULLOUE812', resulting in large differences in grain yield. Here, we examined the underlying causes of the difference in grain fertility between these accessions under long-term treatment with 150 or 200 mM NaCl from the seedling stage to harvest and identified quantitative trait loci (QTLs) for maintaining grain fertility. In an artificial pollination experiment of the two accessions, grain fertility was significantly reduced only in OUC613 plants produced using pollen from plants grown under NaCl stress, suggesting that the low grain fertility of OUC613 was mainly due to reduced pollen fertility. Using QTL-seq combined with exome-capture sequencing and composite interval mapping of recombinant inbred lines derived from a cross between OUE812 and OUC613, we identified a QTL (qRP-2Hb) for grain fertility on chromosome 2H. The QTL region includes two genes encoding an F-box protein and a TIFY protein that are associated with male sterility, highlighting the importance of this region for maintaining grain fertility under salt stress.
    2018年12月, 研究論文（学術雑誌）, 共同, 68, 5, 1344-7610, DOI(公開)(r-map), 561, 570
  • Finding the superior allele of japonica-type for increasing stem lodging resistance in indica rice varieties using chromosome segment substitution lines
    Mulsanti, Indria Wahyu; Yamamoto, Toshio; Ueda, Tadamasa; Samadi, Ahmad Fahim; Kamahora, Eri; Rumanti, Indrastuti Apri; Vo Cong Thanh; Adachi, Shunsuke; Suzuki, Sakae; Kanekatsu, Motoki; Hirasawa, Tadashi; Ookawa, Taiichiro
    RICE
    SPRINGEROPEN
    Background: In cereal crops, stem lodging can be classified into two types: stem-breaking type and stem-bending type. To improve stem-lodging resistance, the strong culm traits of superior lodging-resistant varieties must be characterized. The identification of quantitative trait loci (QTLs) and the corresponding genes associated with the parameters for bending moment at breaking (M) and flexural rigidity (FR) is expected to enable the efficient development of lodging-resistant varieties. A set of Chromosome Segment Substitution Lines (CSSLs) derived from the cross between Takanari and Koshihikari were used in this study to identify QTLs associated with lodging resistance. Results: The indica variety Takanari possesses large M due to its large section modulus (SM) despite its small bending stress (BS), whereas Takanari also has large FR due to its large secondary moment of inertia (SMI) and Young's modulus (YM). The QTLs for BS were assigned to chromosomes 3, 5, 6, 8, 9, 10, 11, and 12. Koshihikari alleles increased BS in these QTLs. The YM was increased by substitution of the Koshihikari chromosomal segments on chromosomes 2, 10, and 11. Other QTLs mapped to chromosomes 7 and 12, such that the Koshihikari alleles contributed to the decrease of YM. QTLs for cellulose density were assigned to chromosomes 1, 3, and 5, which were replaced by substitutions of Koshihikari segments. The QTLs for hemicellulose, cellulose, and holocellulose densities identified on chromosome 5 overlapped with those for BS, indicating the positive effect of the Koshihikari segment on increasing BS. Conclusions: These results suggested that the QTLs for the densities of cell wall materials in japonica varieties contributed to increased BS and might be utilized for improving lodging resistance in indica varieties of rice.
    2018年04月18日, 研究論文（学術雑誌）, 共同, 11, 1939-8425, DOI(公開)(r-map)
  • A near-isogenic rice line carrying a QTL for larger leaf inclination angle yields heavier biomass and grain
    San, Nan Su; Ootsuki, Yosuke; Adachi, Shunsuke; Yamamoto, Toshio; Ueda, Tadamasa; Tanabata, Takanari; Motobayashi, Takashi; Ookawa, Taiichiro; Hirasawa, Tadashi
    FIELD CROPS RESEARCH
    ELSEVIER SCIENCE BV
    Manipulating plant architecture is a promising strategy for further improving rice production. The canopy extinction coefficient (k), the most important parameter of canopy architecture, represents the characteristics of light penetration into the canopy, and is determined mainly by the leaf inclination angle. With its erect leaves, the high-yielding indica cultivar 'Takanari' has a smaller k during ripening than the elite japonica cultivar `Koshihikari'. Using chromosome segment substitution lines derived from a cross between 'Takanari' and 'Koshihikari', we previously detected a quantitative trait locus (QTL) for leaf inclination angle on a chromosome 3. Here, we tested a near-isogenic line (NIL-3) carrying the 'Talcanari' allele of a QTL for larger leaf inclination angle on chromosome 3, qLIA3, in the 'Koshihikari' genetic background for the effects of qLIA3 on k, dry matter production, and grain yield. NIL-3 had leaves with a larger inclination angle from the full heading through ripening stages and a smaller k at the ripening stage than 'Koshihikari'. There were no differences in plant height, panicle size, heading date, leaf area index, or individual leaf photosynthesis between NIL-3 and 'Koshihikari'. Biomass at harvest was significantly greater in NIL-3 than in 'Koshihikari' owing to a higher net assimilation rate during ripening, resulting in a higher grain yield. qLIA3 might incorporate a promising gene for improving rice production.
    2018年04月15日, 研究論文（学術雑誌）, 共同, 219, 0378-4290, DOI(公開)(r-map), 131, 138
  • Differences in lamina joint anatomy cause cultivar differences in leaf inclination angle of rice
    San, Nan Su; Yamashita, Masahiro; Adachi, Shunsuke; Tanabata, Takanari; Ookawa, Taiichiro; Hirasawa, Tadashi
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    Leaf erectness is an important agronomic trait for improving canopy photosynthesis in rice. It is well known that leaf inclination angle (LIA) decreases after expansion during ripening. However, the high-yielding indica cultivar Takanari' retains a greater LIA during ripening than the high-quality japonica cultivar 'Koshihikari. To clarify the cause of the cultivar difference in LIA, we investigated anatomical characteristics of the lamina joint of a flag leaf. We found a close linear correlation between LIA at the centre and at the base of the leaf blade in both cultivars during ripening. The length of the lamina joint increased significantly more on the adaxial side of a leaf (the margin of the collar) than on the abaxial side (the abaxial side of the central part of the collar) in 'Koshihikari' after leaf expansion, but there was no clear difference in 'Takanari'. We found a close linear correlation between the ratio of lamina joint length on the adaxial to abaxial sides and LIA in 'Koshihikari' and Takanari' during ripening. In 'Koshihikari, the average length of cells on the adaxial side increased significantly after leaf expansion, with no significant increase in that on the abaxial side and no significant change in cell number on either side. In Takanari', cell length and cell number showed no significant changes on either side of the lamina joint. We conclude that the cultivar difference in LIA during ripening is caused mainly by cell elongation on the adaxial side of the lamina joint.
    2018年, 研究論文（学術雑誌）, 共同, 21, 4, 1343-943X, DOI(公開)(r-map), 302, 310
  • Characterization of 140 Japanese and world rice collections cultivated in Nihonmatsu-city in Fukushima in terms of radiocesium activity concentrations in seed grains and straws to explore rice cultivars with low radiocesium accumulation
    Kojima, Katsuhiro; Ookawa, Taiichiro; Yamaya-Ito, Hiroko; Salem, Djedidi; Ohkama-Ohtsu, Naoko; Bellingrath-Kimura, Sonoko Dorothea; Yokoyama, Tadashi
    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
    SPRINGER
    We studied varietal difference in radiocesium accumulation by using Japanese and World rice collection for future development of low accumulation varieties. As a result, the radiocesium activity concentration varied by 12- and 22-fold in seed grains and straws, respectively. When we examined the seed grain to straw ratio of radiocesium activity concentration, paddy rice cultivars of Japonica sub-species showed a lower result than Indica and Javanica paddy rice cultivars. These observations suggest that the Japonica paddy rice cultivars may have the property of repressing radioactive cesium translocation to edible parts.
    2017年11月, 研究論文（学術雑誌）, 共同, 314, 2, 0236-5731, DOI(公開)(r-map), 1009, 1021
  • Leaf photosynthetic rate and mesophyll cell anatomy changes during ontogenesis in backcrossed indica x japonica rice inbred lines
    He, Wenxing; Adachi, Shunsuke; Sage, Rowan F.; Ookawa, Taiichiro; Hirasawa, Tadashi
    PHOTOSYNTHESIS RESEARCH
    SPRINGER
    The high-yielding indica rice variety, NULLTakanari', has the high rate of leaf photosynthesis compared with the commercial japonica varieties. Among backcrossed inbred lines from a cross between 'Takanari' and a japonica variety, NULLKoshihikari', two lines, BTK-a and BTK-b, showed approximately 20% higher photosynthetic rate than that of 'Takanari' for a flag leaf at full heading. This is a highest recorded rate of rice leaf photosynthesis. Here, the timing and cause of the increased leaf photosynthesis in the BTK lines were investigated by examining the photosynthesis and related parameters, as well as mesophyll cell anatomy during ontogenesis. Their photosynthetic rate was greater than that of 'Takanari' in the 13th leaf, as well as the flag leaf, but there were no differences in the 7th and 10th leaves. There were no consistent differences in the stomatal conductance, or the leaf nitrogen and Rubisco contents in the 13th and flag leaves. The total surface area of mesophyll cells per leaf area (TA(mes)) in the 13th and flag leaves increased significantly in the BTK lines due to the increased number and developed lobes of mesophyll cells compared with in 'Takanari'. The mesophyll conductance (g (m)) became greater in the BTK lines compared with 'Takanari' in the flag leaves but not in the 10th leaves. A close correlation was observed between TA(mes) and g (m). We concluded that the increased mesophyll conductance through the development of mesophyll cells during the reproductive period is a probable cause of the greater photosynthetic rate in the BTK lines.
    2017年10月, 研究論文（学術雑誌）, 共同, 134, 1, 0166-8595, DOI(公開)(r-map), 27, 38
  • Characterization of 140 Japanese and world rice collections cultivated in Nihonmatsu-city in Fukushima in terms of radiocesium activity concentrations in seed grains and straws to explore rice cultivars with low radiocesium accumulation
    Katsuhiro Kojima, Taiichiro Ookawa, Hiroko Yamaya, Djedidi Salem, Naoko Ohkama-Ohtsu, Sonoko Dorothea Bellingrath-Kimura, Tadashi Yokoyama
    Journal of Radioanalytical and Nuclear Chemistry
    2017年09月, 研究論文（学術雑誌）, 共同, 314, 2, DOI(公開)(r-map), 1009, 1021
  • Differences in dry matter production, grain production, and photosynthetic rate in barley cultivars under long-term salinity
    Tadashi Hirasawa, Kosuke Sato, Makoto Yamaguchi, Ryohei Narita, Asuka Kodama, Shunsuke Adachi,Taiichiro Ookawa and Kazuhiro Sato
    Plant Production Scinece
    2017年06月, 研究論文（学術雑誌）, 共同, 20, 3, 288, 299
  • Characterization of a genomic region that maintains chlorophyll and nitrogen contents during ripening in a high-yielding stay-green rice cultivar
    Yamamoto, Toshio; Suzuki, Tadafumi; Suzuki, Kenji; Adachi, Shunsuke; Sun, Jian; Yano, Masahiro; Ookawa, Taiichiro; Hirasawa, Tadashi
    FIELD CROPS RESEARCH
    ELSEVIER SCIENCE BV
    The high-yielding indica x japonica rice (Oryza sativa L) cultivar Akenohoshi tends to maintain a higher photosynthetic rate during ripening owing to its higher nitrogen accumulation and nitrogen partitioning to leaves than the commercial japonica cultivar Koshihikari. By using recombinant inbred lines derived from a cross between Akenohoshi and Koshihikari, we detected at least 6 quantitative trait loci (QTLs) for maintaining higher leaf chlorophyll content, 4 QTLs for nitrogen content, and 5 QTLs for the rate of nitrogen transport to shoots during ripening in the paddy field. Then we developed two chromosome segment substitution lines carrying Akenohoshi segments on the short arm of chromosome 3, where the QTLs for chlorophyll content reduction were clustered, in the Koshihikari genetic background. The lines showed higher rate of nitrogen transport to shoots, leaf chlorophyll and nitrogen contents, and therefore a higher rate of leaf photosynthesis, than Koshihikari. We concluded that a 7.7-Mb region present in both two lines, named qCHR1, is important for maintaining chlorophyll and nitrogen contents during senescence. The Akenohoshi allele at qCHR1 increased nitrogen accumulation and nitrogen partitioning to leaves during ripening, but did not change yield. (C) 2017 Elsevier B.V. All rights reserved.
    2017年05月, 研究論文（学術雑誌）, 共同, 206, 0378-4290, DOI(公開)(r-map), 54, 64
  • Characterization of a genomic region that maintains　chlorophyll and nitrogen contents during ripening in a high-yielding stay-green rice cultivar
    Toshio Yamamoto, Tadafumi Suzuki, Kenji Suzuki, Shunsuke Adachia,Jian Suna, Masahiro Yano, Taiichiro Ookawa, Tadashi Hirasawa
    Field Crops Research
    2017年03月, 研究論文（学術雑誌）, 共同, 206, 54, 64
  • Fine Mapping of Carbon Assimilation Rate 8, a Quantitative Trait Locus for Flag Leaf Nitrogen Content, Stomatal Conductance and Photosynthesis in Rice
    Adachi, Shunsuke; Yoshikawa, Kazuaki; Yamanouchi, Utako; Tanabata, Takanari; Sun, Jian; Ookawa, Taiichiro; Yamamoto, Toshio; Sage, Rowan F.; Hirasawa, Tadashi; Yonemaru, Junichi
    Frontiers in Plant Science
    FRONTIERS MEDIA SA
    Increasing the rate of leaf photosynthesis is one important approach for increasing grain yield in rice (Ora sativa). Exploiting the natural variation in CO2 assimilation rate (A) between rice cultivars using quantitative genetics is one promising means to identify genes contributing to higher photosynthesis. In this study, we determined precise location of Carbon Assimilation Rate 8 (CAR8) by crossing a high-yielding indica cultivar with a Japanese commercial cultivar, Fine mapping suggested that CAR8 encodes a putative Heme Activator Protein 3 (OsHAP3) subunit of a CCAAT box binding transcription factor called OsHAP3H. Sequencing analysis revealed that the indica allele of CAR8 has a 1-bp deletion at 322 bp from the start codon, resulting in a truncated protein of 125 amino acids. In addition, CAR8 is identical to DTH8/Ghd8/LHD1, which was reported to control rice flowering date. The increase of A is largely due to an increase of RuBP regeneration rate via increased leaf nitrogen content, and partially explained by reduced stomatal limitation via increased stomatal conductance relative to A. This allele also increases hydraulic conductivity, which would promote higher stomatal conductance. This indicates that CAR8 affects multiple physiological aspects relating to photosynthesis. The detailed analysis of molecular functions of CAR8 would help to understand the association between photosynthesis and flowering and demonstrate specific genetic mechanisms that can be exploited to improve photosynthesis in rice and potentially other crops.
    2017年01月, 研究論文（学術雑誌）, 共同, 8, 1664-462X, DOI(公開)(r-map)
  • Differences in dry matter production, grain production, and photosynthetic rate in barley cultivars under long-term salinity
    Hirasawa, Tadashi; Sato, Kosuke; Yamaguchi, Makoto; Narita, Ryohei; Kodama, Asuka; Adachi, Shunsuke; Ookawa, Taiichiro; Sato, Kazuhiro
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    Soil salinity is a major environmental stress causing significant loss of crop productivity. Barley (Hordeum vulgare L.) is one of the few field crops that can grow in salt-affected fields and varietal differences in productivity under salinity conditions were known. To clarify the trait most responsible for grain production under salt stress, barley cultivars that were salt tolerant (OUE812) or salt sensitive (OUC613) were grown from seedling to harvest stage in vermiculite containing various concentrations of NaCl. Dry weight of aboveground parts and grain weight decreased significantly with increasing NaCl concentration. The dry weight of the aboveground parts and grain weight decreased more significantly in OUC613 than in OUE812 for plants treated with 150 mM and 200 mM NaCl. A marked reduction in ripening percentage caused significantly decreased grain production in OUC613 as compared with OUE812. In plants treated with 200 mM NaCl, the photosynthetic rate decreased three weeks after starting the NaCl treatment, but a significant difference between cultivars in photosynthetic rate did not appear until seven weeks of NaCl treatment. OUE812 kept a higher photosynthetic rate during ripening than did OUC613 and dry matter production during the period from ripening to harvest was significantly larger in OUE812 than in OUC613. Keeping a higher photosynthetic rate might have contributed to higher grain production in OUE812. Higher ripening percentage and higher rate of photosynthesis during ripening might be target traits in breeding to improve the tolerance of barley to long-term salt stress.
    2017年, 研究論文（学術雑誌）, 共同, 20, 3, 1343-943X, DOI(公開)(r-map), 288, 299
  • A quick determination of root resistance to water transport in paddy rice
    Adachi, Shunsuke; Ookawa, Taiichiro; Hirasawa, Tadashi
    PLANT PRODUCTION SCIENCE
    TAYLOR & FRANCIS LTD
    Hydraulic resistance in plants is one of the most important factors responsible for changes in leaf water potential that is an indicator of plant water stress. Although the hydraulic resistance to passive water transport (R-pa) is a robust index in paddy rice (Oryza sativa), measurement is both time-consuming and labour-intensive. Here, we describe on a quick method to measure hydraulic resistance to osmotic water transport (R-os) by measuring the xylem sap exudation rate and osmotic water potential. In a greenhouse experiment, R-os responded significantly to soil temperature, but under field conditions soil temperature varied considerably less than air temperature. In the field experiment, R-os of six rice cultivars at two growth stages was strongly positively correlated with R-pa. We conclude that measuring R-os could be used to evaluate root water transport capacity in paddy rice under conditions with adequate soil water.
    2017年, 研究論文（学術雑誌）, 共同, 20, 3, 1343-943X, DOI(公開)(r-map), 273, 278
  • Precise estimation of genomic regions controlling lodging resistance using a set of reciprocal chromosome segment substitution lines in rice
    Taiichiro Ookawa, Ryo Aoba, Toshio Yamamoto, Tadamasa Ueda, Toshiyuki Takai, Shuichi Fukuoka, Tsuyu Ando, Shunsuke Adachi, Makoto Matsuoka, Takeshi Ebitani, Yoichiro Kato, Indria Wahyu Mulsanti, Masahiro Kishii, Matthew Reynolds, Francisco Piñera, Toshihisa Kotake, Shinji Kawasaki, Takashi Motobayashi and Tadashi Hirasawa
    Scientific Reports
    2016年07月, 研究論文（学術雑誌）, 共同, 6, 30572, DOI(公開)(r-map), 1, 12
  • Changes in hydraulic conductance cause the difference in growth response to short-term salt stress between salt-tolerant and -sensitive black gram (Vigna mungo) varieties
    Khin Thuzar Win, Aung Zaw Oo, Taiichiro Ookawa, Motoki Kanekatsu, Tadashii Hirasawa
    Journal of Plant Physiology
    2016年03月, 研究論文（学術雑誌）, 共同, 193, DOI(公開)(r-map), 71, 78
  • Effect of two whole-crop rice (Oryza sativa L.) cultivars on methane emission and Cu and Zn uptake in a paddy field fertilized with biogas slurry
    Aye Thida Win, Koki Toyota, Daisuke Ito, Seiya Chikamatsu, Takashi Motobayashi, Natsuko Takahashi, Taiichiro Ookawa & Tadashi Hirasawa
    Soil Science and Plant Nutrition
    2016年01月, 研究論文（学術雑誌）, 共同, 62, 1, DOI(公開)(r-map), 99, 105
  • Detection of QTL for exudation rate at ripening stage in rice and its contribution to hydraulic conductance
    Toshio Yamamoto, Tadafumi Suzuki, Kenji Suzuki, Shunsuke Adachi, Jian Sun, Masahiro Yano, Taiichiro Ookawa and Tadashi Hirasawa
    Plant Science
    2015年09月, 研究論文（学術雑誌）, 共同, 241, DOI(公開)(r-map)
  • Natural variation in the flag leaf morphology of rice due to a mutation of the NARROW LEAF 1 gene in Oryza sativa L..
    Fumio Taguchi-Shiobara, Tatsuya Ota, Kaworu Ebana, Taiichiro Ookawa, Masanori Yamasaki, Takanari Tanabata, Utako Yamanouchi, Jianzhong Wu, Nozomi Ono, Yasunori Nonoue, Kazufumi Nagata, Shuichi Fukuoka, Hideyuki Hirabayashi, Toshio Yamamoto and Masahiro Yano
    Genetics
    2015年08月, 研究論文（学術雑誌）, 共同, 10, DOI(公開)(r-map), 1534
  • Isolation of a novel lodging resistance QTL gene involved in strigolactone signaling and its pyramiding with a QTL gene involved in another mechanism.
    Kenji Yano, Taiichiro Ookawa, Koichiro Aya, Yusuke Ochiai, Tadashi Hirasawa, Takeshi Ebitani, Takeshi Takarada, Masahiro Yano, Toshio Yamamoto, Shuichi Fukuoka, Jianzhong Wu, Tsuyu Ando, Reynante Lacsamana Ordonio, Ko Hirano and Makoto Matsuoka
    Molecular Plant
    2015年02月, 研究論文（学術雑誌）, 共同, 8, 2, DOI(公開)(r-map), 303, 314
  • Increased lodging resistance in long-culm, low-lignin gh2 rice for improved feed and bioenergy production
    Taiichiro Ookawa, Kazuya Inoue, Makoto Matsuoka, Takeshi Ebitani, Takeshi Takarada, Toshio Yamamoto, Tadamasa Ueda, Tadashi Yokoyama, Chisato Sugiyama, Satoshi Nakaba, Ryo Funada, Hiroshi Kato, Motoki Kanekatsu, Koki Toyoda, Takashi Motobayashi, Mehran Vazirzanjani, Seisyu Tojo and Tadashi Hirasawa
    Scientific Reports
    2014年10月, 研究論文（学術雑誌）, 共同, 4, -, DOI(公開)(r-map), 6567
  • Effect of biogas slurry application on CH4 and N2O emissions, Cu and Zn uptakes by whole crop rice in a paddy field in Japan
    Aye Thida Wina, Koki Toyotaa, Khin Thawda Wina, Takashi Motobayashib, Taiichiro Ookawab, Tadashi Hirasawab, Dingjiang Chen and Jun Luc
    Soil Science and Plant Nutrition
    2014年06月, 研究論文（学術雑誌）, 共同, -, -, 1, 12
  • Introgression of two chromosome regions for leaf photosynthesis from an indica rice into the genetic background of a japonica rice
    Shunsuke Adachi, Leticia Z. Baptista, Tomohiro Sueyoshi, Kazumasa Murata, Toshio Yamamoto, Takeshi Ebitani, Taiichiro Ookawa and Tadashi Hirasawa
    Journal of Experimental Botany
    2014年03月, 研究論文（学術雑誌）, 共同, 65, 8, 2049, 2056
  • A natural variant of NAL1, selected in high-yield rice breeding programs, pleiotropically increases photosynthesis rate
    Toshiyuki Takai, Shunsuke Adachi, Fumio Taguchi-Shiobara, Yumiko Sanoh-Arai, Norio Iwasawa, Satoshi Yoshinaga, Sakiko Hirose, Yojiro Taniguchi, Utako Yamanouchi, Jianzhong Wu, Takashi Matsumoto, Kazuhiko Sugimoto, Katsuhiko Kondo, Takashi Ikka, Tsuyu Ando, Izumi Kono, Sachie Ito, Ayahiko Shomura, Taiichiro Ookawa, Tadashi Hirasawa, Masahiro Yano, Motohiko Kondo and Toshio Yamamoto
    Scientific Reports
    2013年08月, 研究論文（学術雑誌）, 共同, 3, 2149, DOI(公開)(r-map)
  • The mesophyll anatomy enhancing CO2 diffusion is a key trait for improving rice photosynthesis
    Shunsuke Adachi, Toru Nakae, Masaki Uchida, Kazuya Soda, Toshiyuki Takai, Takao Oi, Toshio Yamamoto, Taiichiro Ookawa, Hiroshi Miyake, Masahiro Yano and Tadashi Hirasawa
    Journal of Experimental Botany
    2013年01月, 研究論文（学術雑誌）, 共同, 64, 4, 1061－1072
  • 「エアーアシスト条播機」を用いて湛水直播した多収性水稲品種タカナリの乾物生産と収量－栽植様式が湛水直播栽培した水稲の生態生理に及ぼす影響－
    向山雄大，本林隆，帖佐直，大川泰一郎，古畑昌巳，東城清秀，平沢正
    日本作物学会紀事
    2012年12月, 研究論文（学術雑誌）, 共同, 81, 4, 414, 423
  • 粉砕程度が稲わら含有デンプンおよび可溶性糖の抽出に及ぼす影響
    須永薫子・本林隆・平沢正・大川泰一郎・帖佐直・東城清秀
    農業施設
    2011年06月, 研究論文（学術雑誌）, 共同, 42, 1, 1, 7
  • 飼料イネの高温メタン発酵特性
    飯野洸・周勝・下ヶ橋雅樹・中島田豊・大川泰一郎・寺田昭彦・細見正明
    環境科学会誌
    2011年05月, 研究論文（学術雑誌）, 共同, 24, 5, 462, 471
  • Hydraulic conductance as well as nitrogen accumulation plays a role in the higher rate of leaf photosynthesis of the most productive variety of rice in Japan.
    Taylaran,R.D., S.Adachi, T.Ookawa, H. Usuda and T. Hirasawa
    Journal of Experimental Botany
    2011年04月, 研究論文（学術雑誌）, 共同, 62, 11, 4067, 4077
  • Identification and characterization of genomic regions on chromosomes 4 and 8 that control the rate of photosynthesis in rice leaves
    Adachi, S., Y. Tsuyu, N. Nito, K. Murata, T. Yamamoto, T. Ebitani, T. Ookawa and T. Hirasawa
    Journal of Experimental Botany
    2011年02月, 研究論文（学術雑誌）, 共同, 62, 6, DOI(公開)(r-map), 1927, 1938
  • New approach for rice improvement using a pleiotropic QTL gene for lodging resistance and yield
    Ookawa, T., T. Hobo, M. Yano, K. Murata, T. Ando, H. Miura, K. Asano, Y. Ochiai, M. Ikeda, R. Nishitani, T. Ebitani, H. Ozaki, E.R. Angeles, T. Hirasawa and M. Matusoka
    Nature Communications
    2010年11月, 研究論文（学術雑誌）, 共同, 1, 132, DOI(公開)(r-map), 1, 11
  • Characterization of a rice variety with high hydraulic conductance and identification of the chromosome region responsible using chromosome segment substitution lines
    Adachi, S., Y. Tsuru, M. Kondo, T. Yamamoto, Y. Arai-Sanoh, T. Ando, T. Ookawa, M. Yano and T. Hirasawa
    Annals of Botany
    2010年09月, 研究論文（学術雑誌）, 共同, 106, 5, DOI(公開)(r-map), 803, 811
  • Identification of chromosome regions cotrolling the leaf photosynthetic rate in rice by using a progeny from japonica and high-yielding indica varieties
    Adachi, S., N. Nito, M. Kondo, T. Yamamoto, Y. Arai- Sanoh, T. Ando, T. Ookawa, M. Yano and T. Hirasawa
    Plant Production Science
    2010年04月, 研究論文（学術雑誌）, 共同, 14, 2, 117, 126
  • 葉身傾斜角度による水稲の個体群吸光係数の簡易評価法の検討
    早田一也・大川泰一郎・本林隆・平沢正
    日本作物学会紀事
    2010年04月, 研究論文（学術雑誌）, 共同, 79, 2, 174, 183
  • Varietal differences in photosynthetic rates in rice plants, with special reference to the nitrogen content of leaves
    Hirasawa, T., S. Ozawa, R.D.Taylaran and T. Hirasawa
    Plant Production Science
    2010年01月, 研究論文（学術雑誌）, 共同, 13, 1, 53, 57
  • Biomass production and lodging resistance in 'Leaf Star', a new long-culm rice forage cultivar
    Ookawa, T., K. Yasuda, M. Seto, K. Sunaga, H. Kato, M. Sakai, T. Motobayashi, S. Tojo and T. Hirasawa
    Plant Production Sceince
    2010年01月, 研究論文（学術雑誌）, 共同, 13, 1, DOI(公開)(r-map), 56, 64
  • Performance of a high-yielding modern rice cultivar Takanari and several old and new cultivars grown with and without chemical fertilizer in a submerged paddy field
    Taylaran, R.D., S.Ozawa, N. Miyamoto, T. Ookawa, T. Motobayashi and T. Hirasawa
    Plant Production Science
    2009年07月, 研究論文（学術雑誌）, 共同, 12, 3, 365, 380
  • Characterization of aroma and agronomic traits in Afghan Native Rice Cultivars
    Sarhadi, W.A., T. Ookawa, T.Yoshihashi, A.K.Madadi, W.Yosofzai, Y.Oikawa and Y.Hirata
    Plant Production Science
    2009年01月, 研究論文（学術雑誌）, 共同, 12, 1
  • 水稲品種ササニシキとハバタキの収量，乾物生産とこれに関わる生理生態的性質の比較
    浅沼俊輔・二戸奈央子・大川泰一郎・平沢正
    日本作物学会紀事
    2008年10月, 研究論文（学術雑誌）, 共同, 77, 4, 474, 480
  • Drought conditions in the ripening stage: Insufficient soil moisture conditions before heading render wheat plants more resistant to drought during ripening
    Saidi,A., T. Ookawa, T. Motobayashi and Tadashi Hirasawa
    Plant Production Science
    2008年10月, 研究論文（学術雑誌）, 共同, 11, 4, 403, 414
  • バイオマスとしてのイネの育成と生産・利用
    大川泰一郎
    農林水産技術研究ジャーナル
    2008年07月, 単独, 31, 7, 38, 42
  • Ecophysiological analysis on effect of planting pattern on biomass production and grain yield in rice
    San-oh,Y., M.Kondo, T.Ookawa and T.Hirasawa
    JARQ
    2008年04月, 共同, 42, 2, 79, 89
  • New target for rice lodging resistance and its effect in a typhoon.
    Ishimaru,K., Togawa, E., Ookawa,T., Kashiwagi,T., Madoka,Y. and Hirotsu, N.
    Planta
    2008年03月, 研究論文（学術雑誌）, 共同, 227, -, 601, 609
  • A wilty mutant of rice has impaired hydraulic conductance.
    Koizumi, K., T. Ookawa, H. Satoh and T. Hirasawa
    Plant and Cell Physiology
    2007年08月, 研究論文（学術雑誌）, 共同, 48, 8, 1219, 1228
  • イネの湾曲型倒伏に対する抵抗性の制御機構
    柏木孝幸,広津直樹,円由香,大川泰一郎,石丸健
    日本作物学会紀事
    2007年01月, 研究論文（学術雑誌）, 共同, 76, 1, 1, 9
  • Effects of planting pattern on the interception of solar radiation by the canopy and the light extinction coefficient of the canopy in rice plants direct-sown in a submerged paddy field
    Y. San-oh, R.P.Oclarit, T.Ookawa, and T. Motobayashi, T. Hirasawa
    Plant Production Science
    2006年09月, 研究論文（学術雑誌）, 共同, 9, 3, 334, 342
  • The effect of planting pattern on the rate of photosynthesis and related processes during ripening in rice plants.
    San-oh, Y., T. Sugiyama, D. Yoshida, T. Ookawa, T. Hirasawa
    Field Crops Reseach
    2006年04月, 研究論文（学術雑誌）, 共同, 96, 113, 124
  • 倒伏抵抗性極強の水稲長稈品種の育成経過および水稲育種における作物学の果たす役割
    大川泰一郎
    農研機構生研センター・ブレインテクノニュース
    2006年03月, 単独, 114
  • Interaction of scion and stock on leaf senescence of soybean plants grafted at mid-stem during ripening
    Taiichiro Ookawa, Noriko Tomita and Tadashi Hirasawa
    Plant Production Science
    2005年01月, 研究論文（学術雑誌）, 共同, 8, 1
  • The effects of planting pattern on the rate of photosynthesis and related processes during ripening in rice plants.
    San-oh, Y., T. Sugiyama, D. Yoshida, T. Ookawa and T. Hirasawa
    Field Crops Research
    2005年, 研究論文（学術雑誌）, 共同, 96, 113, 124
  • Hydraulic conductivity and aquaporins of cortical cells in gravitropically bending roots of Pisum sativum L.
    Miyamoto,N., M. Katsuhara, T. Ookawa, K. Kasamo and T. Hirasawa
    Plant Production Science
    2005年, 研究論文（学術雑誌）, 共同, 8, 515, 524
  • The root tip and accelerating region suppress elongation of the decelerating without any effects on cell turgor in primary roots of maize under water stress.
    Shimazaki,Y., T. Ookawa and T. Hirasawa
    Plant Physiology
    2005年, 研究論文（学術雑誌）, 共同, 2005, 458, 465
  • Effects of exogenous cytokinin on leaf levels of ribulose-1,5-bisphosphate carboxylase / oxygenase and the accumulation and partitioning of nitrogen in paddy rice at the ripening stage.
    Ookawa, T., Naruoka, Y., Sayama, A. and Hirasawa, T.
    Crop Sci.
    2004年11月, 研究論文（学術雑誌）, 共同, 44
  • Effects of a reduction in soil moisture from one month before flowering through ripening on dry matter production and ecophysiological characteristics of wheat plants.
    Plant Prod. Sci.
    2004年, 研究論文（学術雑誌）, 共同, 7, 143, 154
  • Effects of soil moisture depletion for one month before flowering on dry matter production and ecophysiological characteristics of wheat plants in wet soil during grain filling
    共著者：Emiko NAKAMURA, Taiichiro OOKAWA, Kuni ISHIHARA and Tadashi HIRASAWA
    Plant Production Science
    2003年09月, 研究論文（学術雑誌）, 共同, 6, 3, 195, 205
  • A comparison of the accumulation and par- titioning of nitrogen in plants between two rice cultivars, Akenohoshi and Nipponbare, at the ripening stage.
    共著者：Taiichiro OOKAWA, Yukiko NARUOKA,Takehito YAMAZAKI,Junko SUGA and Tadashi HIRASAWA
    Plant Production Science
    2003年09月, 研究論文（学術雑誌）, 共同, 6, 3, 172, 178
  • Effects of soil moisture depletion for one month before flowering on dry matter production and ecophysiological characteristics of wheat plants in wet soil during grain filling.
    Nakamura, E., Ookawa, T., Ishihara, K. and Hirasawa, T.
    Plant Prod. Sci.
    2003年, 研究論文（学術雑誌）, 共同, 6, 195, 205
  • Comparison of dry matter production and associated characteristics between direct-sown and transplanted rice plants in a submerged paddy field and relationships to planting patterns
    San-oh, Y. Mano, Y., Ookawa, T. and Hirasawa, T.
    Field Crops Res.
    2003年, 研究論文（学術雑誌）, 共同, 87, 43, 58
  • 湛水直播栽培した水稲タカナリの乾物生産特性－慣行移植栽培した水稲との比較
    共著者：山王裕見子、富沢洋平、真野ゆう子、大川泰一郎、平沢正
    日本作物学会紀事、71巻、3号、317-327
    2002年09月, 研究論文（学術雑誌）, 共同
  • Comparisons of dry matter production and the related characters between transplanted and direct- -sown plants in the submerged paddy field in rice cultivar, Takanari, with reference to planting pattern.
    共著者：山王裕見子、真野ゆう子、大川泰一郎、平沢正
    The 24th International Rice Research Conference
    2002年09月, 共同
  • Water uptake and hydraulic properties of elongating cells in hydrotropically bending roots of Pisum sativum L.
    共著者：Naoko MIYAMOTO, Taiichiro OOKAWA, Hideyuki TAKAHASHI and Tadashi HIRASAWA
    Plant and Cell Physiology
    2002年04月, 研究論文（学術雑誌）, 共同, 43, 4, 393, 401
  • 湛水直播栽培した水稲の生育と倒伏およびこれに関係する性質の品種間差－苗立ち密度に着目して
    共著者：山王裕見子、大川泰一郎、相沢奈美江、平沢正
    日本作物学会紀事
    2001年12月, 研究論文（学術雑誌）, 共同, 70, 4, 515, 524
  • Cytokinin levels in root exudates and leaf senescence after flowering in maize plants.
    共著者：近藤晃代、大川泰一郎、重盛勲、三木一嘉、平沢正
    The 6th Symposium of the International Society of Root Research
    2001年11月, 共同
  • Characteristics of dry matter production in direct sown rice plants in submerged paddy field.
    共著者：山王裕見子、富沢洋平、大川泰一郎、平沢正
    The 4th Asian Crop Science Conference.
    2001年04月, 共同
  • Analysis of the factors causing diffe- rences in the leaf- senescence pattern between between soybean cultivars, Enrei and Tachinagaha －Compa- rison of root length and exudation rate among grafted plants－
    共著者：Taiitchiro OOKAWA、Miyoko NISHIYAMA、Jun TAKAHIRO、Kuni ISHIHARA、Tadashi HIRASAWA
    Plant Production Science、４巻、１号、３－８.
    2001年03月, 共同
  • Comparisons of photos- ynthetic rate and dry matter production between maize plants, which differ in leaf color degradation after flowering.
    共著者：近藤晃代、大川泰一郎、重盛勲、三木一嘉、平沢正
    The 3rd International Crop Science Congress.
    2000年08月, 共同
  • Factors of differeng reduction in leaf photosynthetic rate due to senenscence between rice cultivars, Akenohoshi and Nipponbare, during ripening.
    共著者：名木宏彰、大川泰一郎、菅純子、平沢正
    The 3rd International Crop Science Congress
    2000年08月, 共同
  • Characters associated with lodging resistance in rice plants directly sown in submerged paddy field.
    共著者：山王裕見子、大川泰一郎、相沢奈美江、平沢正
    The 3rd International Crop Science Congress.
    2000年08月, 共同
  • The effects of irrigation regimes on water use, dry matter production and physi- ological responses of paddy rice.
    共著者：Taiitchiro OOKAWA、Jun LU, Tadashi HIRASAWA
    Plant and Soil、223巻、２号、207－216.
    2000年06月, 共同
  • Differences in leaf senescence among reci- procally grafted plants of soybean cultivars, Enrei and Tachinagaha
    共著者：Taiitchiro OOKAWA、Miyoko NISHIYAMA、Jun TAKAHIRO、Kuni ISHIHARA、Tadashi HIRASAWA
    Plant Production Science、２巻、１号、 51－52.
    1999年03月, 共同
  • ダイズ品種エンレイとタチナガハの収量、乾物生産の異なる要因の生理生態学的解析
    共著者：大川泰一郎、高瀬陽子、石原邦、平沢正
    日本作物学会紀事
    1999年03月, 研究論文（学術雑誌）, 共同, 68, 1, 105, 111
  • Varietal difference in leaf senescence during ripening and its causal factors in soybean plants.
    共著者：大川泰一郎、高瀬陽子、佐藤あや、鷹広純、西山弥代子、石原邦、平沢正
    The 3rd Asian Crop Science Conference
    1998年04月, 共同
  • 多収性水稲品種タカナリの光合成特性の解析．
    共著者：徐銀発、大川泰一郎、石原邦
    日本作物学会紀事
    1997年12月, 研究論文（学術雑誌）, 共同, 66, 4, 616, 628
  • 水稲における稈基部の挫折強度形質の遺伝的特徴－コシヒカリと中国117号との交配F1～F3を用いて
    共著者：大川泰一郎、石原邦
    日本作物学会紀事
    1997年12月, 研究論文（学術雑誌）, 共同, 66, 4, 604, 609
  • 水稲多収性品種タカナリの収量と乾物生産過程の解析．－1991年から1994年の４年間－
    共著者：徐銀発、大川泰一郎、石原邦
    日本作物学会紀事
    1997年03月, 研究論文（学術雑誌）, 共同, 66, 1, 42, 50
  • Physiolocal and ecologyical characte-ristics of high yielding rice cultivar in rice.
    共著者：徐銀発、大川泰一郎、石原邦
    Proceedings of the 2nd　Asian crop science Congress、408-409.
    1996年08月, 共同
  • Comparison of growthand yield between F1 hybrid and its parental rice cultivars with reference to high yielding characters.
    共著者：石原邦、平沢正、大川泰一郎
    Proceedings of the 2nd　Asian crop science Congress、406-407.
    1996年08月, 共同
  • Genetic analysis of the characteristics related to lodging re-sistance in a cross between Koshihikari and Chugoku 117.
    共著者：大川泰一郎、石原邦
    Proceedings of the 2nd Asian crop science Congress、808-809.
    1996年08月, 共同
  • 水稲における耐倒伏性に関係する性質の地上部環境条件による変化とその品種間差異
    共著者：大川泰一郎、富所康弘、石原邦
    日本作物学会紀事
    1993年12月, 研究論文（学術雑誌）, 共同, 62, 4, 525, 533
  • Varietal differences in physical characte- ristics of the culm related to lodging re-sistance in paddy rice.
    共著者：大川泰一郎、石原邦
    Proceedings of the 1st Asian crop science Congress、133-141.
    1993年09月, 共同
  • 水稲稈基部の曲げ応力に影響する細胞壁構成成分の品種間差異
    共著者：大川泰一郎、石原邦
    日本作物学会紀事
    1993年09月, 研究論文（学術雑誌）, 共同, 62, 3, 378, 384
  • 水稲の耐倒伏性に関与する稈の物理的性質の品種間差異
    共著者：大川泰一郎、石原邦
    日本作物学会紀事
    1992年09月, 研究論文（学術雑誌）, 共同, 61, 3, 419, 425
  • Differences in photosynthetic rates among leaves at equivalent positions on the main stem and its tillers in rice plants.
    共著者：大川泰一郎、黒田栄喜、石原邦
    Proceedings of the 9th international congress on photosynthesis、647－650.
    1992年08月, 共同
  • 水稲における主茎と分げつ茎の同伸葉の光合成速度の相違
    共著者：大川泰一郎、黒田栄喜、石原邦
    日本作物学会紀事
    1991年09月, 研究論文（学術雑誌）, 共同, 60, 3, 413, 420
  • 草高の異なる水稲品種の乾物生産の相違とその要因の解析，とくに個体群内におけるガス拡散に着目して
    共著者：黒田栄喜、大川泰一郎、石原邦
    日本作物学会紀事
    1989年09月, 研究論文（学術雑誌）, 共同, 58, 3, 374, 382

著書

  • 作物生産生理学の基礎　倒伏とそのメカニズム
    大川泰一郎
    農文協
    2016年10月, 978-4-540-12209-5
  • Suetainable biomass systems
    Taiichiro Ookawa, (Eds. Seishu Tojo and Tadashi Hirasawa)
    Academic Press
    2014年01月, 978-0-12-404609-2
  • 作物学
    大川泰一郎，今井勝・平沢正編
    文英堂出版
    2013年11月, 978-4-8300-4126-6
  • 作物学用語事典
    日本作物学会
    農文協
    2010年03月
  • われら共有の農業
    2002年03月

研究発表、招待講演等

  • サトイモ主要品種におけるIoT点滴灌漑栽培法の確立
    日本作物学会第255回講演会
    2023年03月29日, 口頭発表（一般）
  • 窒素肥料削減下における水稲の初期成長，窒素利用効率に関わる形質の ゲノムワイドアソシエーション解析
    日本作物学会第255回講演会
    2023年03月29日, 口頭発表（一般）
  • Useful QTLs that improve lodging resistance in temperate japonica rice from a landrace ‘Omachi’ in Japan
    Iternational Symposium on Rice Functional Genomics 2022
    2022年11月04日, 口頭発表（一般）
  • 水稲の倒伏抵抗性に関わる葉鞘関連形質のゲノムワイド関連解析
    日本作物学会第254回講演会
    2022年09月13日, 口頭発表（一般）
  • 有機栽培における水稲の深水抵抗性に関連する有用形質および遺伝子の探索
    日本作物学会第253回講演会
    2022年03月27日, 口頭発表（一般）
  • コシヒカリ／雄町組換え自殖系統群を用いた水稲の倒伏抵抗性関連形質のQTL解析
    日本作物学会第253回講演会
    2022年03月27日, 口頭発表（一般）
  • Utilization of SEMIDWARF1 for vigorous growth, weed competitiveness and deep-water resistance in rice varieties for organic farming
    Asian Crop Science Association Conderence
    2021年09月09日, ポスター発表
  • Identification of QTLs for strong culm with pleiotropic effect on panicle morphology by GWAS using rice varieties in Japan
    Asian Crop Science Association Conference 2020
    2021年09月09日, 口頭発表（一般）
  • New strong culm QTLs detected by genome-wide association study using rice varieties in Japan
    2019 International Symposium of Rice Functional Genomics
    2019年11月05日, ポスター発表
  • IoT点滴灌漑サトイモ多収栽培のための土壌水分制御の検討
    日本作物学会第２４７回講演会
    2019年03月29日, 口頭発表（一般）
  • 異なる水稲品種に由来する４つの強稈遺伝子の組合せが強稈関連形質の集積効果に及ぼす影響
    日本作物学会第２４７回講演会
    2019年03月28日, 口頭発表（一般）
  • イネの強稈性に関与する皮層繊維組織の厚さに関わる量的形質遺伝子座の同定
    日本作物学会第247回講演会
    2019年03月28日, 口頭発表（一般）
  • Improvement of lodging resistance in rice by the pyramiding four strong culm genes identified from superior lodging resistant varieties
    International Rice Congress 2018
    2018年10月17日, 口頭発表（一般）
  • Characterization of biomass production and the root system related to drought resistance in the super long-culm rice line ‘Monster Rice 2’
    International Rice Congress
    2018年10月15日, ポスター発表
  • 水稲極長稈育成系統TAT-26のバイオマス生産，窒素蓄積，および生理的窒素利用効率の特性
    日本作物学会第245回講演会
    2018年03月29日, 口頭発表（一般）
  • 水稲の強稈・多収関連形質の量的形質遺伝子座解析―極太稈系統LTAT-29とタカナリの組換え自殖系統群を用いて
    日本作物学会第245回講演会
    2018年03月29日, 口頭発表（一般）
  • 塩ストレスを維持するオオムギの量的形質遺伝子座（QTL）の同定
    日本作物学会第245回講演会
    2018年03月29日, 口頭発表（一般）
  • 水稲の強稈および収量関連形質の量的形質遺伝子座解析
    日本育種学会第132回講演会
    2017年10月07日, 口頭発表（一般）
  • Identification of the Quantitative Trait Loci for Breaking and Bending Types Lodging Resistance in Rice, Using Recombinant Inbred Lines Derived from Koshihikari and a Strong Culm Variety, Leaf Star
    Asian Crop Science Conference 2017
    2017年06月06日, ポスター発表
  • Analysis on the quantitative trait loci for the strong-culm and yield associated traits in rice, using F2 populations derived from a cross between the super thick-culm and super grain-bearing line LTAT-29 and Takanari
    Asian Crop Science Conference 2017
    2017年06月06日, ポスター発表
  • Estimation of the Quantitative trait loci Associated with Breaking and Bending Types Lodging Resistance in Rice Using Chromosome Segment Substitution Lines Derived from a Cross between Takanari and Koshihikari
    Asisan Crop Science Conference 2017
    2017年06月06日, ポスター発表
  • Development of the Pyramiding Lines with Strong Culm Genes Derived from Crosses among the SCM Near Isogenic Lines in Rice
    Asian Crop Science Conference 2017
    2017年06月06日, 口頭発表（招待・特別）
  • 水稲稈の構造性，非構造性炭水化物蓄積に関わる量的形質遺伝子座を同定し，多用途稲品種の改良に適用する
    日本作物学会第243回講演会
    2017年03月30日, 口頭発表（招待・特別）
  • 水稲の強稈および収量関連形質の量的形質遺伝子座解析 ―極太稈・極多着粒系統LTAT-29とタカナリのF2分離集団を用いて―
    日本作物学会第243回講演会
    2017年03月30日, 口頭発表（一般）
  • 異なる水稲品種に由来する強稈遺伝子の組合せが強稈関連形質の集積効果に及ぼす影響
    日本作物学会第243回講演会
    2017年03月30日, 口頭発表（一般）
  • Identification of the QTLs for breaking and bending type lodging resistance in rice using chromosome segment substitution lines derived from a cross between Takanari and Koshihikari
    日本作物学会第２４１回講演会
    2016年03月29日, 口頭発表（一般）
  • Identification of the quantitative trait loci for strong culm associated with lodging resistance in rice, using recombinant inbred lines derived from a cross between rice varieties, Leaf Star and Koshihikari
    日本作物学会第２４１回講演会
    2016年03月29日, 口頭発表（一般）
  • 水稲の強稈および収量関連形質に関わる量的形質遺伝子座のコシヒカリへの集積効果
    日本作物学会第２４１回講演会
    2016年03月29日, 口頭発表（一般）
  • 水稲の強稈質に関わる皮層繊維組織を厚くする量的形質遺伝子座の特定 ―タカナリを遺伝背景とするコシヒカリ第2, 9染色体の組換え固定系統を用いて―
    日本作物学会第２４１回講演会
    2016年03月29日, 口頭発表（一般）
  • 水稲における強稈関連形質の量的形質遺伝子座の特定とその作用機作
    日本作物学会第239回講演会
    2015年03月27日, 口頭発表（一般）
  • 水稲の強稈性に関与する太稈，強稈質関連形質の量的形質遺伝子座解析 －リーフスターとコシヒカリの組換え自殖系統を用いて－
    日本作物学会第239回講演会
    2015年03月27日, 口頭発表（一般）
  • 水稲稈の高炭水化物蓄積および強稈質に関わる形質の量的遺伝子座解析 －リーフスターとコシヒカリの組換え自殖系統を用いて－
    日本作物学会第239回講演会
    2015年03月27日, 口頭発表（一般）
  • 水稲における半矮性遺伝子sd1が強稈性および収量に及ぼす影響 －タカナリとコシヒカリの正逆NILs-SD1を用いて-
    日本作物学会第239回講演会
    2015年03月27日, 口頭発表（一般）
  • タカナリ／コシヒカリ染色体断片置換系統群を用いた水稲の強稈性に関わる形質のQTLの推定
    日本育種学会第127回講演会
    2015年03月22日, 口頭発表（一般）
  • Analysis of QTLs for strong culm traits, using reciprocal chromosome segment substitution lines derived from the cross between rice varieties, Koshihikari and Takanari
    The 8th Crop Science Conference
    2014年09月23日, ポスター発表
  • Estimation of quantitative trait loci associated with lodging resistance using a set of reciprocal chromosome segment substitution lines derived from crosses between rice varieties Koshihikari and Takanari
    The 8th Asian Crop Science Conference
    2014年09月23日, ポスター発表
  • New approach for improving the lodging resistance in rice using superior alleles of strong culm genes in natural variants
    The 8th Asian Crop Science Conference
    2014年09月23日, 口頭発表（一般）
  • Dissection of the quantitative trait loci for strong culm traits associated with lodging resistance in rice
    IRRI Stem Workshop
    2014年06月24日, 口頭発表（招待・特別）
  • 水稲における倒伏抵抗性に関与する第3染色体の強稈形質遺伝子座の機能
    日本作物学会第237回講演会
    2014年03月30日, ポスター発表
  • 水稲における倒伏抵抗性多収品種の特性の解明と強稈性に関わる形質のゲノム解析
    日本作物学会第237回講演会
    2014年03月29日, その他
  • コシヒカリ／タカナリ染色体断片置換系統群を用いた 水稲の強稈性に関与する形質のQTLの推定
    日本作物学会第237回講演会
    2014年03月29日, 口頭発表（一般）
  • 水稲品種コシヒカリを遺伝背景とする強稈関連量的形質遺伝子座の集積
    日本育種学会第124回講演会
    2013年10月11日, 口頭発表（一般）
  • 水稲の倒伏抵抗性を高める強稈関連形質の遺伝子座の推定 ―コシヒカリとタカナリの正逆染色体断片置換系統群を用いて―
    日本作物学会第236回講演会
    2013年09月11日, 口頭発表（一般）
  • 水稲における倒伏抵抗性に関与する強稈遺伝子座の推定 ―コシヒカリとタカナリの染色体断片置換系統および組換固定系統を用いて―
    日本作物学会第235回講演会
    2013年03月28日, 口頭発表（一般）
  • 水稲品種リーフスターとリーフスター/タカナリ交雑後代における強稈性に関与する稈の構造的特性
    日本作物学会第235回講演会
    2013年03月28日, 口頭発表（一般）
  • タカナリ/コシヒカリ染色体断片置換系統群を用いた水稲の強稈性関連形質の遺伝子座の推定
    日本作物学会第234回講演会
    2012年09月10日, 口頭発表（一般）
  • ゴールドハル水稲品種リーフスターとその交雑後代系統の強稈性をもたらす要因
    日本作物学会第233回講演会
    2012年03月30日, 口頭発表（一般）
  • メタン発酵消化液の施用および密植が飼料イネ品種リーフスターの生育・乾物生産に及ぼす影響について
    日本作物学会第233回講演会
    2012年03月30日, 口頭発表（一般）
  • Properties of superior lodging resistance in a new gh line derived from a cross between rice cultivars, 'Leaf Star' and 'Takanari' developed for forage use.
    The 7th Asian Crop Science Conference
    2011年09月28日, 口頭発表（一般）
  • Characteristics of biomass production and photosynthesis in progeny lines of a cross between rice cultivars ‘Akenohoshi’ and ‘Takanari’
    The 7th Asian Crop Science Conference
    2011年09月28日, ポスター発表
  • 水稲における倒伏抵抗性に関与する強稈性に関わる量的形質遺伝子座のマッピング ―コシヒカリと中国117号の第2, 3染色体組換固定系統を用いて―
    日本作物学会第232回講演会
    2011年09月02日, 口頭発表（一般）
  • 水稲品種リーフスターの低リグニン性に関わる生理的，遺伝的要因の解析
    日本作物学会第230回講演会
    2010年09月04日, 口頭発表（一般）
  • フィールドで栽培される作物の生態生理機能を解明し品種改良に貢献する作物学
    日本作物学会第229回講演会ミニシンポジウム
    2010年03月31日, 口頭発表（招待・特別）
  • 水稲多収性品種アケノホシ/タカナリ交雑後代系統における光合成および受光態勢の特性
    日本作物学会第229回講演会
    2010年03月30日, 口頭発表（一般）
  • 水稲の倒伏抵抗性に関わる稈の太さの遺伝子座の解析－コシヒカリと中国117号の第2,3染色体のQTL候補領域の分離集団を用いて－
    日本作物学会第229回講演会
    2010年03月30日, ポスター発表
  • 水稲における倒伏抵抗性に関与する太稈形質の遺伝子座の解析－コシヒカリと中国１１７号の第３染色体組換固定系統群を用いて－
    日本作物学会第228回講演会
    2009年09月30日, 口頭発表（一般）
  • コシヒカリを遺伝背景とし太稈化した準同質遺伝子系統の特性評価
    日本作物学会第228回講演会
    2009年09月30日, 口頭発表（一般）
  • 水稲の登熟期における葉の緑色程度，根から地上部への窒素輸送速度および根の水伝導度のQTL解析－コシヒカリ/アケノホシＦ４集団を用いて
    日本作物学会第228回講演会
    2009年09月29日, 口頭発表（一般）
  • Properties of culm strength, lignin content and cinnamyl-alcohol dehydrogenase in the rice cultivar, Leaf Star with high lodging resistance –Comparison with parents and gold hull and internode mutants
    Plant Biology 2009
    2009年07月22日, ポスター発表
  • 水稲飼料用品種リーフスターとその両親における稈のリグニン合成酵素シナミルアルコールデヒドロゲナーゼの特性－ゴールドハル突然変異体との比較－
    日本作物学会第２２７回講演会
    2009年03月28日, ポスター発表
  • 水稲品種リーフスターの茎葉部貯蔵炭水化物の蓄積特性
    日本作物学会第２２７回講演会
    2009年03月28日, ポスター発表
  • 水稲品種アケノホシとタカナリの交雑後代系統における光合成特性の解析
    日本作物学会第２２７回講演会
    2009年03月28日, ポスター発表
  • 栽植密度と窒素追肥が水稲の乾物生産量，子実収量，植物体窒素量と土壌窒素の動態に及ぼす影響－飼料用イネ品種「リーフスター」を用いて－
    日本作物学会第２２７回講演会
    2009年03月28日, ポスター発表
  • Improvements in biomass production, lodging resistance and straw composition for bioenergy production in rice.
    The Pan American Congress on Plants & Bioenergy
    2008年06月24日, 口頭発表（一般）
  • 水稲の挫折型倒伏抵抗性に関与する断面係数のＱＴＬ解析－コシヒカリと中国117号の第３染色体組換え固定系統群を用いて
    日本作物学会第225回講演会
    2008年03月27日, 口頭発表（一般）
  • リグニン合成酵素欠損突然変異体gh2におけるリグニン密度の減少が倒伏抵抗性に及ぼす影響
    日本作物学会第225回講演会
    2008年03月27日, 口頭発表（一般）
  • 水稲の倒伏抵抗性に関与する稈基部節間の太さに関するＱＴＬの推定
    日本作物学会第225回講演会
    2008年03月27日, 口頭発表（一般）
  • コシヒカリを遺伝背景とするハバタキ染色体断片置換系統群を用いた水稲の倒伏抵抗性に関与するQTL解析
    日本作物学会第225回講演会
    2008年03月27日, 口頭発表（一般）
  • Improvement of the lodging resistance in long culm rices for producing high biomass and yield -Breeding process of superior lodging resistance cultivar 'Leaf star'
    Bio Asia 2007 : The 6th Asian Crop Science Association Conference and the 2nd International Conference on Rice for the future
    2007年11月09日, 口頭発表（招待・特別）
  • QTL analysis for the associated traits of flexural rigidity related to lodging resistance in rice, using backcross inbred lines developed from the progenies of Chugoku 117/Koshihikari//Koshihikari cross.
    The 6th Asian Crop Science Association Conference
    2007年11月07日, ポスター発表
  • QTL analysis for the associated traits of the breaking strength related to the lodging resistance in rice, using the progenies of Chugoku 117/Koshihikari//Koshihikari cross.
    The 6th Asian Crop Science Association Conference
    2007年11月07日, ポスター発表
  • QTL analysis of the traits affecting lodging resistance using the series of Habataki chromosome segment substitution in rice cultivar, Sasanishiki.
    The 6th Asian Crop Science Association Conference
    2007年11月07日, ポスター発表
  • ササニシキを遺伝背景としたハバタキ染色体断片置換系統群を用いた水稲の倒伏抵抗性に関与するQTL解析
    日本作物学会第２２４回講演会
    2007年09月27日, 口頭発表（一般）
  • 水稲長稈品種リーフスターの強稈性に関与するリグニン組成
    日本作物学会第２２３回講演会
    2007年03月29日, 口頭発表（一般）
  • 飼料用水稲長稈品種・系統のバイオマス生産特性および倒伏抵抗性に関与する性質
    日本作物学会第２２３回講演会
    2007年03月29日, 口頭発表（一般）
  • サイトカイニンが水稲葉身の光合成速度に及ぼす影響とその要因
    日本植物生理学会２００７年度年会
    2007年03月28日, 口頭発表（一般）
  • 水稲のたわみ型倒伏抵抗性に関与する稈の曲げ剛性関連形質のQTL解析―コシヒカリと中国117号の戻し交雑自殖系統群を用いて－
    日本作物学会第２２２回講演会
    2006年10月29日, 口頭発表（一般）
  • 水稲の倒伏抵抗性に関与する稈の挫折強度関連形質のＱＴＬ解析ーコシヒカリと中国１１７号の戻し交雑自殖系統群を用いてー
    日本作物学会第２２１回講演会
    2006年03月31日, その他
  • ササニシキ/ハバタキ染色体断片置換系統群を用いた水稲の倒伏抵抗性に関与する形質の解析と遺伝子座の推定
    日本作物学会第２２１回講演会
    2006年03月31日, 口頭発表（一般）
  • 耐倒伏性極強の飼料用水稲長稈新品種リーフスターの育成とその稈の特性
    日本作物学会第２２１回講演会
    2006年03月31日, 口頭発表（一般）
  • 倒伏抵抗性極強の飼料用水稲長稈新品種「リーフスター」の育成経過とその特性
    日本育種学会講演会
    2006年03月29日, 口頭発表（一般）
  • コシヒカリ/ハバタキの染色体断片置換系統群を用いた水稲の光合成速度に関わる量的形質遺伝子座の推定と機能解析－第11染色体に着目して－
    日本作物学会第２２７回講演会
    2001年03月28日, ポスター発表

外部研究資金等

  • イネの強稈性に関与する有用遺伝子の単離とその集積
    受託研究, 自 2016年04月01日, 至 2017年03月31日
  • イネの強稈性に関与する有用遺伝子の単離とその集積
    受託研究, 自 2015年04月09日, 至 2016年03月01日
  • ゲノム情報を活用した農畜産物の次世代生産基盤技術の開発プロジェクト（イネのDNAマーカー選抜育種支援システムの構築）光合成効率を高めるQTLの単離と集積
    受託研究, 自 2014年04月01日, 至 2015年03月02日
  • ゲノム情報を活用した農畜産物の次世代生産基盤技術の開発プロジェクト（イネのDNAマーカー選抜育種支援システムの構築）光合成効率を高めるQTLの単離と集積積
    受託研究, 自 2013年06月07日, 至 2014年03月03日
  • 自給飼料を基盤とした国産畜産物の高付加価値化技術の開発（多収で消化性に優れた稲発酵粗飼料用品種の育成（低リグニン性を付与した高消化性の多収稲発酵粗飼料用系統の開発））
    受託研究, 自 2012年04月10日, 至 2013年03月01日
  • 平成24年度新農業展開ゲノムプロジェクト（イネの質的形質遺伝子の単離と機能解明）（イネの耐倒伏性に関与する遺伝子の単離と機能解析）
    受託研究, 自 2012年04月06日, 至 2013年03月01日
  • イネの耐倒伏性に関与する遺伝子の単離と機能解析
    受託研究, 自 2011年04月01日, 至 2012年03月01日
  • 多収で消化性に優れた稲発酵粗飼料用品種の育成（低リグニン性を付与した高消化性の多収稲発酵粗飼料用系統の開発）
    受託研究, 自 2011年04月01日, 至 2012年03月01日
  • 多収で消化性に優れた稲発酵粗飼料用品種の育成（低リグニン性を付与した高消化性の多収稲発酵粗飼料用系統の開発）
    受託研究, 自 2010年08月25日, 至 2011年03月01日
  • イネの耐倒伏性に関与する遺伝子の単離と機能解析
    受託研究, 自 2010年04月01日, 至 2011年03月01日
  • リグニン合成酵素等の利用による高消化性発酵粗飼料用稲品種の育成と主要病害抵抗性の評価
    受託研究, 自 2009年04月01日, 至 2010年03月01日
  • イネの耐倒伏性に関与する遺伝子の単離と機能解析
    受託研究, 自 2009年04月01日, 至 2010年03月01日
  • リグニン合成酵素等の利用による高消化性発酵粗飼料用稲品種の育成と主要病害抵抗性の評価
    受託研究, 自 2008年05月01日, 至 2009年03月02日
  • リグニン合成酵素等の利用による高消化性発酵粗飼料用稲品種の育成と主要病害抵抗性の評価
    受託研究, 自 2007年08月14日, 至 2008年02月29日
  • 高バイオマス・多収性水稲長稈品種が備えるべき耐倒伏性に関与する極強稈形質のQTL解析
    受託研究, 自 2007年04月02日, 至 2008年03月12日
  • 温暖地東部向き高消化性発酵粗飼料用稲品種の育成
    受託研究, 自 2006年09月01日, 至 2007年02月28日
  • 高バイオマス・多収性水稲長稈品種が備えるべき耐倒伏性に関与する極強稈形質のQTL解析
    受託研究, 自 2006年04月03日, 至 2007年03月19日
  • リグニン合成酵素等の利用による高消化性発酵粗飼料用稲品種の育成と主要病害抵抗性の評価
    受託研究, 自 2006年, 至 2010年
  • 高バイオマス・多収性水稲長稈品種が備えるべき耐倒伏性に関与する極強稈形質のＱＴＬ解析
    受託研究, 自 2006年, 至 2009年

委員歴

  • 日本作物学会
    副会長
    自 20220401, 至 20240331
  • 農林水産省大臣官房統計部
    水稲の作柄に関する委員会委員
    自 20200801, 至 20220331
  • 日本作物学会
    副会長
    自 20200501, 至 20220331
  • 国際協力機構
    専門部門員
    自 20200401, 至 20210315
  • 国際協力機構
    専門部門員（農業分野）
    自 20190401, 至 20200331
  • 日本作物学会
    英文誌編集委員会
    自 20180401, 至 20200331
  • 日本作物学会
    評議員
    自 20180401, 至 20200331
  • 国際協力機構
    ベトナムカントー大学強化附帯プロジェクト専門部会（農業分野）
    自 20180401, 至 20190331
  • 持続的農業発展に資する農業微生物利用技術の教育研究および普及協議会
    理事
    自 20180201, 至 20190331
  • 国際協力機構
    ベトナムカントー大学強化附帯プロジェクト専門部会（農業分野）
    自 20170401, 至 20180331
  • 日本作物学会
    評議員
    自 201604, 至 20180331
  • 日本作物学会
    英文誌編集委員会
    自 20160401, 至 20180331
  • 日本作物学会
    評議員
    自 201404, 至 201603
  • 日本作物学会
    会長付幹事
    自 201004, 至 201203
  • 日本作物学会
    和文誌編集委員会幹事
    自 200804, 至 201003
  • 日本作物学会
    和文誌編集委員
    自 2004, 至 0000
  • 日本作物学会
    海外交流推進委員
    自 2001, 至 0000
  • 日本作物学会
    アジア作物学会議実行委員
    自 1995, 至 0000
  • 日本作物学会
    編集委員会幹事
    自 1995, 至 0000
  • 日本作物学会
    アイソトープ委員
    自 1995, 至 0000

メディア報道

  • 東京農工大など、水田の水かさを増やして育てられるイネに特有のゲノム領域を特定水かさを増して雑草を抑制、農薬使用量の削減に期待
    農工大らの研究グループが、水田の水かさを増して雑草発生を抑制する「深水管理」条件でよく育つイネについて、特有のゲノム領域を特定したと、紹介される。
    日経バイオテク
    自 2023年12月07日, 至 2023年12月07日
  • 「ラジオのまなざし～東京農工大学～」
    いわき市民コミュニティ放送（FMいわき）
    自 2023年10月01日, 至 2023年10月01日
  • 東京農工大と新潟大、日本在来イネ品種「雄町」の茎の太さに関わるゲノム領域を特定
    東京農工大学大学院連合農学研究科千装公樹氏、同大学大学院農学研究院生物生産科学部門大川泰一郎教授、新潟大学大学院自然科学研究科山崎将紀教授らの共同研究グループは、茎の太い日本在来イネ品種「雄町」の茎の太さをもたらすゲノム領域を量的形質遺伝子座解析（QTL解析）により特定することに成功したと紹介される。
    日本経済新聞
    自 2023年02月03日, 至 2023年02月03日
  • Next Tech2050　台風でも倒れにくイネ　DNA情報活用で効率よく品種改良
    東京農工大学はイネのDNA情報を活用した「ゲノム育種」によって、美味しいコメの代表格であるコシヒカリの味を保ちつつ茎が太く丈夫な品種を開発したと紹介される。
    日経産業新聞／WEB
    自 2022年10月07日, 至 2022年10月11日
  • 東京農工大が野口酒造と協定　東京産米で日本酒
    東京農工大学大学院農学研究院と野口酒造店は、日本酒造りの地域連携や事業化について基本協定を結んだと紹介される。
    日刊工業新聞
    自 2022年07月27日, 至 2022年07月27日
  • アフガニスタン元留学生と家族の命を守りたい　#アフガン#避難民支援
    2002年にアフガニスタン教育支援を開始し、70名もの修士号・博士号取得者を輩出している東京農工大学の取り組みが紹介される。
    ＧｏｏｄＭｏｒｎｉｎｇ
    自 2022年07月15日, 至 2022年07月15日
  • 元留学生焦燥の待機
    東京農工大学の船田良教授、大川泰一郎教授が、元留学生のアフガン人の早期退避要請の署名運動をしたことが紹介される。
    毎日新聞
    自 2022年01月06日, 至 2022年01月06日
  • 有機栽培や減農薬のコメ、スマート農業で実りアップ
    有機栽培や減農薬のコメの生産者がロボットや人工知能（AI）などスマート農業の導入例として、スタートアップ企業の有機米デザインが開発した抑草ロボットや東京農工大学の大川泰一郎教授が開発した有機栽培に向いている米の品種が紹介される。
    日本経済新聞
    自 2021年12月11日, 至 2021年12月11日
  • Academics call for better support for Afghan alumni
    日本の学者たちが、アフガニスタンの元留学生とその家族への支援措置を拡大するよう日本政府に圧力をかけるネットワークを立ち上げたことが紹介され、東京農工大学の大川泰一郎教授のコメントが掲載される。
    UniversityWorldNews
    自 2021年10月20日, 至 2021年10月20日
  • 「親族も殺された・・・」アフガン元留学生が日本にSOS教え子の救出“署名”に約３萬の賛同集まる
    東京農工大学の大川泰一郎教授がアフガニスタンの元留学生から救出を求めるメールが届き、署名サイトで元留学生の早期救出と支援に向けた賛同者を呼び掛けていることが紹介される。
    ABEMA／ TIMES／Livedoorニュース／yahooニュース
    自 2021年09月30日, 至 2021年09月30日
  • アフガニスタンの教え子を助けて！ 大学教授らが元日本留学生の救出と支援求める署名呼びかけ
    東京農工大学の大川泰一郎教授らが、サイトChange.orgで教え子の元留学生らの早期救出と支援を求める署名を集め、日本政府に提出する予定だということが紹介される。
    BuzzFeedNews／yahooニュース
    自 2021年09月17日, 至 2021年09月18日
  • 昔の稲、太く強かった？ゲノム解析　倒状対策に新知見　東京農工大
    東京農工大学が名古屋大学との共同研究により、茎が長く台風で倒れやすいと考えられていた日本固有のイネの中から、茎を太く強くする新たなゲノム領域の特定に成功したと発表したことが紹介される。
    yahooニュース
    自 2021年08月23日, 至 2021年08月23日
  • 昔の稲、太く強かった？東京農工大ゲノム解析　倒状対策に新知見
    東京農工大学が名古屋大学との共同研究により、茎が長く台風で倒れやすいと考えられていた日本固有のイネの中から、茎を太く強くする新たなゲノム領域の特定に成功したと発表したことが紹介される。
    日本農業新聞／WEB
    自 2021年08月23日, 至 2021年08月23日
  • 日本固有イネ、茎強くするゲノム領域特定東京農工大
    東京農工大学の大川泰一郎教授、野村和宏大学院生らの研究グループが日本固有のイネの中から茎を強くする新たな全遺伝情報（ゲノム）領域を特定したことが紹介される。
    日刊工業新聞／WEB
    自 2021年08月05日, 至 2021年08月05日
  • 農工大、スーパー台風にも倒れないイネの茎を太く強くするゲノム領域を特定
    東京農工大学が名古屋大学との共同研究により、茎が長く台風で倒れやすいと考えられていた日本固有のイネの中から、茎を太く強くする新たなゲノム領域の特定に成功したと発表したことが紹介される。
    マイナビニュース／gooニュース／ニコニコニュース
    自 2021年08月05日, 至 2021年08月05日
  • ６月２３日の関連記事スクラップ／旭川医大学長・解任へ／国語入試は時事テーマ・多様性がカギ／ＯＣ再開へ
    東京農工大学の広域都市圏フィールドサイエンス教育研究が紹介された日本経済新聞の記事が紹介される。
    yahooニュース
    自 2021年06月23日, 至 2021年06月23日
  • 東京農工大フィールドサイエンスセンターロボ使い稲作の負担軽く
    東京農工大学広域都市圏フィールドサイエンス教育研究センターが取り組む稲作の研究が紹介される。
    日本経済新聞／WEB
    自 2021年06月23日, 至 2021年06月23日
  • はまなかあいづ
    東京農工大学の大川泰一郎教授、大学院生光田侑子さんらによる農業復興研究活動が紹介される。
    NHK福島／WEB
    自 2019年11月20日, 至 2019年11月20日
  • 大学の復興支援策 紹介いわきでワークショップ
    東京農工大学院の大川泰一郎教授が、情報技術（ＩＴ）を生かした富岡町での農業支援について説明したことが紹介される。
    福島民報新聞
    自 2019年08月07日, 至 2019年08月07日
  • 二本松・人気酒造が新酒「桜福姫」　新品種米・NOKO1号で醸造
    東京農工大学農学部・大川泰一郎教授と、福島大学食農学類・横山正特任教授の協力の下、コシヒカリをベースに開発された「NOKO1号」で造られた新酒「桜福姫(さくらふくひめ)」の発表会が行われたことが紹介される。
    福島経済新聞／yahooニュース／gooニュース
    自 2019年07月27日, 至 2019年07月27日
  • 福島版富岡町で東京農工大生が田植え
    東京農工大の学生が５月３０日、富岡町の農業渡辺伸（のぼる）さんの水田で田植えを行ったことが紹介され、大川泰一郎教授や本学大学院性のコメントが紹介される。
    NHK／WEB
    自 2019年05月30日, 至 2019年05月30日
  • 農業復興支援に理解富岡小中富岡校
    「スマート農業」など、東京農工大学が取り組む農業復興支援活動について、大川泰一郎教授が説明したことが紹介される。
    福島民報
    自 2018年12月18日, 至 2018年12月18日

所属学協会

  • 日本作物学会
    自 2014年04月, 至 2016年03月
  • 日本作物学会
    自 2010年04月, 至 2012年03月
  • 日本作物学会
    自 2008年04月, 至 2010年03月
  • 日本作物学会
    自 2004年
  • 日本作物学会
    自 2001年
  • 日本作物学会
    自 1995年
  • 日本作物学会
    自 1995年
  • 日本作物学会
    自 1995年
  • 日本育種学会
  • 日本植物生理学会

受賞

  • 日本作物学会
    日本作物学会賞
    水稲における倒伏抵抗性多収品種の特性の解明と強稈性に関わる形質のゲノム解析
    2014年03月29日
  • 日本作物学会
    日本作物学会論文賞
    2013年03月28日
  • 日本作物学会
    日本作物学会論文賞
    Biomass production and lodging resistance in 'Leaf Star', a new long-culm rice forage cultivar
    2012年03月29日
  • 日本育種学会
    日本育種学会賞
    日本各地に適した稲発酵粗飼料および飼料米向け水稲品種シリーズの開発
    2011年09月23日
  • 日本作物学会論文賞
    2007年03月27日
  • 日本作物学会研究奨励賞
    1996年

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