| Project/Area Number |
23770027
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Ecology/Environment
|
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| Research Institution | Ibaraki University (2013)
Tokyo University of Agriculture (2011-2012) |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 葉寿命 / 光合成 / 窒素 / 最適モデル / 繁殖 / 群落光合成 / ダイズ / イネ / 呼吸 / 二酸化炭素 / 安定同位体 |
|---|
| Research Abstract |
The effects of whole-plant growth on leaf dynamics were studied. First, the growth, reproduction and leaf dynamics were investigated in an annual herb Xanthium canadense grown in a low- and high density. The results did not support the hypothesis that plants having higher respiration cost at whole-plant level would have leaves with shorter leaf lifespan. Second, in nodulating soybean and its non-nodulating isogenic line, regulation of leaf loss involved various factors, such as light availability within the canopy, N acquisition and N demands in new organs. These effects varied among the growth stages and CO2 levels. Third, I examined if a leaf was shed at the optimal timing that increases the whole-plant photosynthesis in stands of rice grown with a different nitrogen and CO2 treatments, and in soybean grown under different tropospheric ozone concentrations. In all cases, the shedding of older leaves occurred later than the optimal time.
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