Flash-induced photophosphorylation in chloroplasts with activated ATPase |
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Authors: | Shinji Morita Shigeru Itoh Mitsuo Nishimura |
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Institution: | Department of Biology, Faculty of Science, Kyushu University 33, Fukuoka 812 Japan |
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Abstract: | Chloroplasts which were rapidly isolated from illuminated leaves showed activity of ATP hydrolysis at a level much higher than that of the dark control. Under the high-intensity illumination or under repetitive flash excitation, the activated chloroplasts synthesized more ATP than those with a low ATP hydrolysis activity. formed under repetitive flashes was smaller in the activated chloroplasts than in the inactive chloroplasts. The inhibition of ATP yield per flash by valinomycin or nigericin in the presence of K+ was stronger in the inactive chloroplasts than in the activated chloroplast. ATP synthesis in the activated chloroplasts seems to have a lower threshold. |
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Keywords: | pH gradient Membrane potential Photophosphorylation ATPase (Spinach chloroplast) DCCD Tricine Chl chlorophyll |
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