| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2014: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2011: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Outline of Final Research Achievements |
Drought response index (DRI) of rice (Oryza sativa L.) was quantified by using various varieties, 3 mapping populations, and near-isogenic lines of Koshihikari and IR64 with heading date and root trait genes/QTLs to dissect its physiological and genetic mechanisms. In the rice variety experiments, DRI was positively related with harvest index, fertility and biomass production under drought treatment and negatively with percentage of infertile panicles, delay in heading, and reduction in plant height. In the mapping population experiments, QTLs for DRI were detected in RM6911-RM6379 in chromosome 2, around RM5953 in chromosome 4, and 2 loci in chromosome 8. Epistasis and QTL by environment interaction for DRI were significant. In the near-isogenic line experiments, DRI increased by the introgression of DEEPER ROOTING 1, a gene to modify root growth angle toward steeper in response to gravity, and Stele Transversal Area 1, a QTL to enlarge transversal area of stele.
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