Effect of Supra-High Irradiation on the Photosynthetic System of the Cyanophyte Synechocystis PCC 6714
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概要
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Stability of thylakoid components under supra-high irradiance was studied with the cyanophyte Synechocystis PCC 6714. The activity of overall photosynthesis was quickly inactivated (T_<1/2>=20 min) under supra-high irradiance (300 W m^<-2>, white light). In parallel with the inactivation of photosynthesis, Q_A in PS II was also inactivated. Both inactivations were accelerated by chloramphenicol (CAP) addition. The reactivation of PS II required weak irradiation and was suppressed by CAP. However, PS I measured as P700 was very stable. The level of PS I measured as P700 was not significantly reduced by the irradiation for 12 h even in the presence of CAP while the level of Cyt b_<559>, component of PS II, was decreased markedly. The function of PS I before and after supra-high irradiation with CAP was examined by comparing sizes of P700 oxidation induced by a short flash, by a continuous light, and by determination of O_2-and ferredoxin-reduction. No difference was observed in PS I actions before and after the irradiation treatment. These results indicate that the PS I complex is very tolerant of supra-high irradiation. However, the cells grown under supra-high irradiance contained much fewer PS I and PS II complexes than Cyt b_6-f complexes. The former levels were reduced to a half to one fourth of those before growth while the level of Cyt b_6-f complex was not reduced so much. A possible mechanism for changes in thylakoid composition under supra-high irradiation was discussed.
- 日本植物生理学会の論文
著者
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Murakami Akio
Department of Cell Biology, National Institute for Basic Biology
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Yokoyama Eiichi
Department of Biology, School of Education, Waseda University
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Sakurai Hidehiro
Department of Biology, School of Education, Waseda University
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Murakami Akio
Department Of Cell Biolog National Institute For Basic Biology
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Sakurai Hidehiro
Department Of Applied Chemistry Graduate School Of Engineering Osaka University
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Fujita Yoshihiko
Department Of Anatomy Division 1 Kinki University School Of Medicine
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Yokoyama Eiichi
Department Of Biology School Of Education Waseda University
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Sakurai Hidehiro
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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FUJITA Yoshihiko
Department of Anatomy (1st Division), Kinki University School of Medicine
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