Effect of imidazole on the activity of photosystem II in spinach chloroplasts

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概要

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• The activity of the Hill reaction was accelerated about 2-3 times in the presence of 1-5 m_M imidazole. However, in chloroplasts uncoupled by carbonyl cyanide m-chlorophenylhydrazone, the acceleration of the Hill activity was not observed in the same imidazole concentration range, but a moderate inhibition of the activity was observed. These results suggest that in the coupled chloroplasts, the enhanced Hill activity by imidazole is due to uncoupling of phosphorylation. Imidazole-washing of chloroplasts at neutral pH caused a moderate inhibition of the Hill reaction to about 60% of the control, while a complete loss of the Hill activity was observed after washing at pH 10.5. In chloroplasts washed with imidazole at pH 10.5, the variable fluorescence yield was also diminished. These activities were restored by adding an artificial electron donor to photosystem II.

• 日本植物生理学会の論文

著者

• Wakamatsu Kunimitsu

  Fukuoka Women's University

• Usami Kazuo

  Fukuoka Women's University

関連論文

• Studies on the Component Responsible for the Oxidation of the Primary Electron Acceptor of Photosystem II in the Presence of 3-(3',4'-Dichlorophenyl)-1,1-Dimethyl Urea : Reactivity to External Reductants
• INHIBITION OF ACEPHATE (N-ACETYL O, S-DIMETHYL THIOPHOSPHORAMIDE) ON SERUM CHOLINESTERASE ACTIVITY
• Effect of imidazole on the activity of photosystem II in spinach chloroplasts

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