| Project/Area Number |
15580011
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | The University of Tokyo |
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Principal Investigator |
SASAKI Haruto The University of Tokyo, Graduate School of Agriculture and Life Sciences, Assistant, 大学院・農学生命科学研究科, 助手 (60225886)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | photosynthesis / rice / CO_2-enrichment / translocation / sink / grain-filling / 13C / electron transfer / 登熟 / 電子伝達 |
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| Research Abstract |
In this study, I examined the effect of CO_2 enrichment on carbon metabolism of rice plants. Firstly, the rice plants grown on the paddy field of Free Air CO_2-enrichment Project were used to investigate the effect of CO_2-enrichment on the distribution and translocation of photosynthate using 13C. As a result, the photosynthate in the plants grown under CO_2-enrichment condition had more effectively shifted to the ear than those under ambient condition. Moreover, in the plants grown under CO_2-enrichment condition the starch stored in leaf sheath at heading stage was shifted into ears more rapidly than in those under ambient condition. These suggested that CO_2-enrichment would promote the translocation and distribution of carbon into sink organ (ears). Secondly, the rice plants were grown under various C0_2 concentrations to examine the effect on leaf photosynthesis. The energy used by photosynthesis and photorespiration decreased with the increasing in atmospheric CO_2 concentrations. Therefore, the C0_2 enrichment was thought to make the more excess energy. However, because the plants under C0_2 enrichment condition grew as well as those under ambient condition, the excess energy might be wasted by activation of alternative system. Moreover, the CO_2-enrichment made the flux of CO_2 from atmosphere to carboxylation site at chloroplast more difficult.
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