Mechanisms of the acido- and thermo-phily of Cyanidium caldarium Geitler I. Effects of temperature, pH and light intensity on the photosynthetic oxygen evolution of intact and treated cells
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概要
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Photosynthetic oxygen evolution in an acido- and thermo-philic unicellular alga, Cyanidium caldarium, was measured under various conditions, using a Clark-type oxygen electrode. 1) Maximum Hill reaction activity with p-benzoquinone as the Hill oxidant was obtained at 45℃ in a wide pH range from 1.0 to 7.0. 2) The pH activity curve showed two peaks at pH 3.0 and 7.0. The Hill activity had an optimum at pH 3.0 in cells preilluminated under strong light (300,000 lux, 30 min, 40℃). Sonication of algal cells abolished the pH 3.0 component of the Hill reaction producing an activity maximum at pH 7.0. 3) Endogenous O_2 evolution in the absence of the Hill oxidant, which lasted for several minutes after illumination, had a maximum at pH 7.0. 4) This endogenous O_2 evolution was abolished by sonication. 5) KCN inhibited endogenous O_2 evolution, but not the Hill reaction in the presence of p-benzoquinone.
- 日本植物生理学会の論文
著者
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Enami Isao
Department of Biology, Faculty of Science, Science University of Tokyo
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Enami Isao
Department Of Biology Faculty Of Science Science University Of Tokyo
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Fukuda Ikujiro
Department Of Biology Faculty Of Science Science University Of Tokyo
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