2013 Fiscal Year Final Research Report
Effects of whole-plant growth on leaf shedding
| 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
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| Keywords | 葉寿命 / 光合成 / 窒素 / 最適モデル |
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| 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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Research Products
(17 results)
