Study for improving rice plant architecture by controlling tiller angle

2019 Fiscal Year Final Research Report

• Project/Area Number: 16K18645
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• 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, 中央農業研究センター, 研究員 (00757908)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: イネ / 分げつ角度 / 開帳性 / 草型

Outline of Final Research Achievements

Near isogenic lines for TAC1, a gene contorting rice tiller angle, of (TAC1-NIL) were developed and their yield and biomass production were investigated in order to reveal an effect of tiller angle modification on biomass production for improving plant architecture.
The biomass production in early growth stage of TAC1-NIL tended to be higher than its control variety, Koshihikari, while that in ripening stage tended to be lower. As a result, grain yield of TAC1-NIL was slightly lower. The canopy light capturing ratio and partitioning of leaf area to vertical line of TAC1-NIL were much different from Koshihikari, suggesting modification of light-intercepting characteristics affected biomass production and yield in TAC1-NIL.

Free Research Field

作物生産科学

Academic Significance and Societal Importance of the Research Achievements

イネの草型の開帳程度は光利用効率に関わる農業生産上重要な形質である。しかし、既存の知見だけでは、それが生産性に及ぼす影響を十分に説明することはできない。特に分げつ角度と生産性の関係に着目した研究は少ない。本研究により、分げつ角度の改変がイネの生産性に与える影響の一端が明らかになった。このことは、ソース能を強化するイネの理想的な草型の提唱、延いてはイネの収量を飛躍的に増大させる新品種の育成や栽培方法の確立に繋げることができる。