Studies on the Hill reaction of membrane fragments of blue-green algae II. The reaction steps inactivated at high water concentration
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概要
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DPIP-photoreduction by membrane fragments of Anabaena cylindrica and A. variabilis was studied to determine which step(s) of the Hill reaction system is inactivated on incubation of the membrane fragments in a medium with a high water concentration (cf. 1). Supplementary experiments were done with Anacystis nidulans and Plectonema boryanum. After inactivation of the Hill system at a high water concentration, DPIP-photoreducing activity was strongly enhanced in the A. variabilis system but less so in the A. cylindrica system by adding DPC, NH_2OH, Mn^<++> or H_2O_2. The activity supported by the added electron donor was inhibited by DCMU. The steady state level of chlorophyll fluorescence was lowered by the inactivation treatment. In the A. variabilis system, the fluorescence yield increased to the original level on the addition of an electron donor. In the A. cylindrica system, the yield was not so strongly enhanced as in the A. variabilis system. We inferred that, in A. variabilis, inactivation occurs in the reaction system before the site which receives electrons from artificial donors, probably including the water oxidation system. In A. cylindrica, besides this site, a site at or near the photochemical system is also blocked. Similar types of inactivation were observed in DPIP-Hill reactions using Anacystis nidulans and Plectonema boryanum preparations. The characteristic stability of the Hill reaction system observed in two Anabaena preparations is probably common to the blue-green algae.
- 日本植物生理学会の論文
著者
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Fujita Yoshihiko
Ocean Research Institute University Of Tokyo
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Suzuki Reiko
Ocean Research Institute University Of Tokyo
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