Reversible Inhibition of the Photosynthetic Water-Splitting Enzyme System by SO_2-Fumigation Assayed by Chlorophyll Fluorescence and EPR Signal in Vivo
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概要
- 論文の詳細を見る
The effect of SO_2 fumigation (2 ppm, v/v) on photosynthesis in spinach leaves in vivo was investigated by measuring Chl a fluorescence (OIDP transient) and the electron paramagnetic resonance (EPR) signal L SO_2 fumigation raised the I level to yield the ID dip and suppressed the DP transient before any visible damage occurred in the leaf. In SO_2-fumigated leaves, the time course of EPR signal I indicates that reduction of P700 by white light illumination was inhibited but dark reduction of P700 was not significantly affected. Photosynthetic O_2 evolution was also inhibited by SO_2 fumigation. All of these effects were reversible after removal of SO_2. The variable part of the fluorescence in the presence of DCMU was only slightly affected and decreased as the fumigation time increased. We concluded that SO_2 fumigation reversibly inhibits the photosynthetic water-splitting enzyme system and it injures the reaction center of PS II in vivo when the fumigation time is prolonged. We discussed the role of possible toxicants derived from SO_2 within the leaf on the basis of the SO_2 action on Chl a fluorescence.
- 日本植物生理学会の論文
著者
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Kondo Noriaki
Division Of Environmental Biology The National Institute For Environmental Studies
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Kondo Noriaki
Division Of Biosciences Graduate School Of Sciences And Engineering Teikyo University Of Science And
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Ito Kuniko
Department Of Environmental Chemistry Faculty Of Science Toho University
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Sugahara Kiyoshi
Division of Environmental Biology, The National Institute for Environmental Studies
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Shimazaki Ken-ichiro
Division of Environmental Biology, The National Institute for Environmental Studies
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Sugahara Kiyoshi
Division Of Environmental Biology The National Institute For Environmental Studies
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Sugahara Kiyoshi
Division Of Enviromental Biology The National Institute For Enviromental Studies
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Shimazaki Ken-ichiro
Division Of Environmental Biology The National Institute For Environmental Studies
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Shimazaki Ken-ichiro
Division Of Environmental Biology National Institute For Environmental Studies
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