| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2013: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2011: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2010: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Research Abstract |
Roots play important roles in crop adaptation to various abiotic stresses such as water stress, but traits responsible for such adaptations may differ with environments. This study aimed at identifying the root traits and their associated QTL, and evaluating their interactions with soil water stresses. We made an extensive survey on genetic resources in rice in the Philippines and evaluated their responses to water stress conditions. We then identified the root plasticity as one of the key traits for adaptation and a QTL that is related with branching on chr 6. Field experiments showed the genotype that showed greater dry matter production under rainfed lowland conditions may have exhibited the root plasticity at soil depths with more available soil moistures. In cases where root plasticity at deeper soil layers were observed, such root plastic development may have occurred in response to the reduction of soil hardness when the soil moisture was high during soil moisture fluctuations.
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