Identification of a novel genetic region related to sink activity of rice for the physiologiy of grain filling

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K15511
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 39020:Crop production science-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Okamura Masaki 国立研究開発法人農業・食品産業技術総合研究機構, 中日本農業研究センター, 主任研究員 (00757908)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: イネ / 登熟 / シンク活性

Outline of Final Research Achievements

In this study, an NIL of high-yielding rice cultivar “Momiroman” with about 2 Mb candidate region of a novel QTL (qGFR10) involved in sink activity was developed, and a large-scale cultivation trial of this NIL and “Momiroman” was conducted to investigate yield and grain filling related traits. However, although the NIL tended to have higher stem NSC translocation, there was no clear difference in yield or ratio of filled grain. In addition, The heading day of NIL was 6 days earlier, which may have affected yield.
After the end of the study period, we will examine whether QTL that increase sink activity can be separated from QTL for heading day, and will examine the effects of qGFR10 on grain filling related traits in more detail.

Free Research Field

作物生理学

Academic Significance and Societal Importance of the Research Achievements

「登熟」は水稲をはじめとする穀物全般の収量向上のため、非常に重要な形質である。にもかかわらず籾の数や大きさなどで決まる「シンク容量」と比較し不明な点が多く、その制御が難しい。本研究では水稲の「登熟向上」に関する新規の遺伝領域を同定するとともに、その知見を活かして、「登熟向上」の生理メカニズムを解明することを目指した。本研究で得られた知見は、登熟の生理メカニズム一端を解明したものであり、水稲をはじめとする穀物の収量向上や安定化に資するものと言える。