Photosynthetic Light-use Efficiency in Rice(Oryza Sativa L.)Leaf under Light with Fluctuating Intensities at Two Different Ambient Humidities
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概要
- 論文の詳細を見る
Photosynthetic and transpiration rates of rice leaf were measured under light with an intensity fluctuating in a wide range of frequencies(2.8×10^-4〜4Hz).The time course of photosynthetic rate differed with the frequency.Under the light with an intensity fluctuating at a frequency of lower than 0.05 Hz, the photosynthetic rate oscillated regularly, and the photosynthetic light-use efficiency(LUE:mean photosynthetic rate under fluctuating light)was constat, independent of the frequency.On the other hand, under the light with an intensity fluctuating at a high frequency(> 0.05 Hz), the time course of photosynthetic rate was constant without oscillation, and LUE increased with increasing frequency.The effect of the fluctuating light intensity was affected by ambient humidity.LUE was higher at the high ambient humidity, although the difference between the photosynthetic rates at high and low ambient humidities was reduced under the light with an intensity fluctuating at a high frequency(> 2 Hz).The present findings suggests that brief leaf movements by natural factors such as wind(leaf flutter)may provide effective intermittent light penetration to lower leaves, and increase the total photosynthetic rate in the canopy.Rapidly fluctuating light intensity may also alleviate the photosynthetic depression caused by stomatal closure frequency observed in the afternoon(known as midday depression).
- 日本作物学会の論文
著者
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TANG Yanhong
Environmental Biology Division, National Institute for Environmental Studies
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KOIZUMI Hiroshi
Institute for Basin Ecosystem Studies, Gifu University
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Tang Yanhong
National Inst. For Environmental Studies Ibaraki Jpn
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Tang Yanhong
Environmental Biology Division National Institute For Environmental Studies
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Tang Yanhong
Institute Of Biological Sciences University Of Tsukuba
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Tang Yanhong
Division Of Environmental Biology National Institute For Environmental Studies
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Kanda Hiroshi
Institute For Basin Ecosystem Studies Gifu University
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Koizumi Hiroshi
Institute For Basin Ecosystem Studies Gifu University
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Koizumi H
Gifu Univ. Gifu Jpn
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Koizumi Hiroshi
Department Of Biology Faculty Of Education And Integrated Arts And Sciences Waseda University
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ITOH KAZUYUKI
National Institute for Agro-Environmental Sciences
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NISHIMURA Seiichi
National Institute of Agro-Environmental Sciences
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Tang Y
Environmental Biology Division National Institute For Environmental Studies
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Tang Yanhong
National Inst. Environmental Studies Ibaraki Jpn
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Nishimura Seiichi
National Institute For Aero-environmental Sciences
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Itoh Kazuyuki
National Institute Of Agro-environmental Sciences
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Itoh Kazuyuki
National Agricultural Research Center For Tohoku Region
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