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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
Authors:Enami, Isao   Fukuda, Ikujiro
Affiliation:Department of Biology, Faculty of Science, Science University of Tokyo Kagurazaka, Shinjuku-ku, Tokyo 162, Japan
Abstract:Photosynthetic oxygen evolution in an acido- and thermo-philicunicellular alga, Cyanidium caldarium, was measured under variousconditions, using a Clark-type oxygen electrode. 1). Maximum Hill reaction activity with p-benzoquinone as theHill oxidant was obtained at 45°C in a wide pH range from1.0 to 7.0. 2) The pH activity curve showed two peaks at pH3.0 and 7.0. The Hill activity had an optimum at pH 3.0 in cellspreilluminated under strong light (300,000 lux, 30 min, 40°C).Sonication of algal cells abolished the pH 3.0 component ofthe Hill reaction producing an activity maximum at pH 7.0. 3)Endogenous O2 evolution in the absence of the Hill oxidant,which lasted for several minutes after illumination, had a maximumat pH 7.0. 4) This endogenous O2 evolution was abolished bysonication. 5) KCN inhibited endogenous O2 evolution, but notthe Hill reaction in the presence of p-benzoquinone. (Received August 19, 1974; )
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