| Budget Amount *help |
¥74,490,000 (Direct Cost: ¥57,300,000、Indirect Cost: ¥17,190,000)
Fiscal Year 2014: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2013: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
Fiscal Year 2012: ¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2011: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2010: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
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| Outline of Final Research Achievements |
Under nitrogen starved conditions, rice plants reduce their active tiller number in vegetative stage and their spikelet number in reproductive stage. However, molecular mechanisms in these responses are largely not known. We have carried out 1) NH4+-signal perception, 2) assimilation and remobilization of nitrogen, 3) metabolic balance between C and N, and 4) modeling of spikelet-ripening to understand molecular mechanisms of response. We obtained clear results, using reverse genetics approaches together with localization works, that glutamine synthetase (GS)1;2 was important in both the primary assimilation of NH4+ and outgrowth of axillary tiller buds, whereas GS1;1 is important in remobilization of N from senescing organs. NADH-glutamate synthase2 was tightly related to the determination of panicle number. These mutants showed metabolic disorder, indicating that N metabolism is important in normal growth and development of rice. Those results were published in several journals.
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