| Project/Area Number |
21380013
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Crop science/Weed science
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
OOKAWA Taiichiro 東京農工大学, 大学院・農学研究院, 准教授 (80213643)
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| Co-Investigator(Kenkyū-buntansha) |
HIRASAWA Tadashi 東京農工大学, 大学院・農学研究院, 教授 (30015119)
YOKOYAMA Tadashi 東京農工大学, 大学院・農学研究院, 教授 (70313286)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2010: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2009: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
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| Keywords | イネ / 強稈性 / バイオマス / 遺伝子座 / 水稲 / 高バイオマス / 多収 / NIL / マッピング / コシヒカリ / 準同質遺伝子系統 / 倒伏抵抗性 / 太稈 / 強稈質 / リグニン / 細胞分裂 |
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| Research Abstract |
Lodging resistance is one of the most important agronomical traits for the rice cultivars with high grain yield and biomass production. To locate the chromosome regions controlling the lodging resistance in rice, we conducted to estimate and characterize the quantitative traits loci(QTLs) responsible for culm mechanical strength using QTL analyses, using a set of backcross inbred lines(BILs) and the chromosome segment substitution lines(SLs) developed from a cross between Koshihikari, and a high lodging resistant cultivars. We identified the effective quantitative trait loci(QTLs) for culm strength, which were designated STRONG CULM2(SCM2) and STRONG CULM3(SCM3). Positional cloning of the gene revealed that SCM2 was identical to APO1, a gene previously reported to control panicle structure. A near-isogenic line carrying SCM2 showed enhanced culm strength and increased spikelet number due to the pleiotropic effects of the gene. Although SCM2 is a gain-of-function mutant of APO1, it does not have the negative effects reported for APO1 over-expression mutants, such as decreased panicle number and abnormal spikelet morphology. The identification of lodging resistance genes by QTL analysis combined with positional cloning is a useful approach for improving lodging resistance and overall productivity in rice.
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