Specific inhibition of photosystem II activity in chlproplasts by fumigation of spinach leaves with SO_2
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概要
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The phytotoxic effects of sulfur dioxide (SO_2) were investigated by fumigating spinach plants with SO_2. Inhibition of 2,6-dichloroindophenol (DCIP) photoreduction was observed in spinach chloroplasts isolated from fumigated leaves. NADP and DCIP photoreductions were inhibited to a similar extent by fumigation with 2.0 ppm SO_2 but electron flow from reduced DCIP to NADP was not affected. When electron flow from H_2O to NADP was inhibited by 36%, a 39% inhibition of non-cyclic photophosphorylation was observed. However, phenazine methosulfate(PMS)-catalyzed cyclic photophosphorylation was as active as in the control chloroplasts. Moreover, in the presence of PMS, no significant suppression was observed in the extent of light-induced H^+ uptake or in the rate of H^+ efflux in chloroplasts. From these results, it can be concluded that SO_2 inhibits the electron flow driven by photosystem II when plants have been fumigated with SO_2. In spinach leaves fumigated with SO_2, the rate of photosynthetic O_2 evolution was reduced under light-limited conditions, while the rate of respiratory O_2 uptake changed slightly.
- 日本植物生理学会の論文
著者
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Sugahara Kiyoshi
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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