Functional analysis of RG5, a locus determining carbohydrate accumulation capacity in rice

2014 Fiscal Year Final Research Report

• Project/Area Number: 24580033
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Crop science/Weed science
• Research Institution: National Institute of Agrobiological Sciences
• Principal Investigator: ISHIMARU Ken 独立行政法人農業生物資源研究所, 植物生産生理機能研究ユニット, 上席研究員 (80370641)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: イネ / 収量特性 / 登熟 / QTL

Outline of Final Research Achievements

In rice, the source capacity is estimated as the total quantity of carbohydrate available. Greater capacity to accumulate carbohydrate is the main target for increasing rice yield potential. RG5 is a locus responsible for increased yield potential across the genetic background by improvement in carbohydrate storage capacity. In this study, our results showed that expansion of leaf area of two leaves below a flag leaf improved storage capacity of RG5. Additionally, it is suggested that a transcriptional control gene might the main candidate gene for RG5. Under the FACE condition, the content of protein and S significantly decreased in grains from “Koshihikari”; by contrast, a chromosomal segment substitution of RG5 was found to maintain protein and S content. Thus, our results proved that the improvement in retranslocation by higher carbohydrate storage capacity might be the main target to diminish the elemental decline in grains grown under elevated CO2 condition.

Free Research Field

作物整理学