A NEW STRATEGY FOR INCREASING BIOMASS PRODUCTION IN RICE-IDENTIFICATION AND PYRAMIDING OF QTLS CONTROLLING HETEROSIS

Research Project

Project/Area Number	21380012
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Crop science/Weed science
Research Institution	The University of Tokyo
Principal Investigator	NEMOTO Keisuke 東京大学, 大学院・農学生命科学研究科, 教授 (40211461)
Project Period (FY)	2009 – 2012
Project Status	Completed (Fiscal Year 2012)
Budget Amount *help	¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000) Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000) Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000) Fiscal Year 2010: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000) Fiscal Year 2009: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Keywords	イネ / 雑種強勢 / QTL / ＱＴＬ / バイオマス / 稲
Research Abstract	To improve biomass production in rice, we identified quantitative trait loci (QTLs) controlling heterosis in japonica-indica hybrid rice. QTLs for biomass and yield components identified in our backcross populations (i.e., japonica x indica recombinant inbred lines backcrossed with the parents) were dominant or partial dominant,and no QTLs were overdominant. This result suggests that the accumulation of dominant-and partial dominant genes is responsible for heterosis in hybrid rice.