2021 Fiscal Year Final Research Report

Identification and utilization of QTLs for the regulation of rice juvenile-adult phase transition

Research Project

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Project/Area Number	19H02929
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 39010:Science in plant genetics and breeding-related
Research Institution	Kyoto University
Principal Investigator	Yoshikawa Takanori 京都大学, 農学研究科, 助教 (00721606)
Co-Investigator(Kenkyū-buntansha)	門田有希岡山大学, 環境生命科学学域, 准教授 (30646089) 小出陽平北海道大学, 農学研究院, 助教 (70712008) 寺石政義京都大学, 農学研究科, 准教授 (80378819) 奥本裕京都大学, 農学研究科, 教授 (90152438)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	イネ / japonica / indica / juvenile-adult相転換 / 栄養成長 / QTL解析 / qJA1 / qJA2
Outline of Final Research Achievements	In the present study, we identified the genetic factors involved in the differentiation of juvenile-adult phase transition during vegetative growth between rice japonica and indica varieties, and attempted to elucidate the effect of phase transition on agricultural traits. The main results were 1) identification of the causal genes for qJA1 and qJA2, and finding related pathways in the transcriptome. 2) We found that the japonica alleles of qJA1 and qJA2 may be suitable for cultivation in high latitude areas. 3) The effect of the growing environment on the phase transition was clarified. 4) It was found that the defense response mechanism against blast disease changes as the progresses of growing stage.
Free Research Field	育種学分野
Academic Significance and Societal Importance of the Research Achievements	本研究はこれまであまり研究対象とならなかったイネの初期生育の違いを「juvenile-adult相転換」という新しい視点から解釈し、その分化に関与した原因遺伝子を同定した。これらの遺伝子はこれまで生育相転換に関与するとは考えられていなかった遺伝子であり、これら遺伝子がトランスクリプトームや農業形質に及ぼす効果について解析を行った。これらの成果はイネの成長について新たな観点を提供し、今後の品種育成において有用な知見となることが期待される。