Effects of dibromothymoquinone and bathophenanthroline on flash-induced cytochrome f oxidation in spinach chloroplasts
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概要
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The effects of several electron transport inhibitors on the magnitude and kinetics of cytochrome f oxidation induced by flash illumination were studied in the α- and γ-band regions. On the flash excitation only a fraction of cytochrome f present in the chloroplasts was oxidized with a half time of 0.1 to 0.3 msec and then reduced with a half time of 10 to 25 msec. Dibromothymoquinone (DBMIB) at concentrations which severely suppressed the reduction of cytochrome f approximately doubled the magnitude of cytochrome f oxidation caused by a flash, mainly by inducing an additional slow oxidation of cytochrome f with a half time longer than 1 msec. Enhancement of the cytochrome f oxidation was also observed in the presence of bathophenanthroline. Such enhanced oxidation induced by the two inhibitors was largely diminished with the addition of reduced 2,6-dichlorophenolindophenol which accelerated cytochrome f reduction. In contrast, the inhibition of cytochrome f reduction by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) was not associated with an increase in the magnitude of cytochrome f oxidation. However, addition of DBMIB to the DCMU-poisoned chloroplasts enhanced cytochrome f oxidation, suggesting that this is related to a block of the electron transport between plastoquinone and cytochrome f The results are explained by assuming the occurrence of an electron carrier between plastoquinone and cytochrome f.
- 日本植物生理学会の論文
著者
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Satoh Kazuhiko
Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja
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KOIKE Hiroyuki
Department of Life Science, Graduate School of Life Science, University of Hyogo
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Katoh Sakae
Department of Pure and Applied Sciences. College of General Education. University of Tokyo
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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Koike Hiroyuki
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Satoh Kazuhiko
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Satoh Kazuhiko
Fac. Science Himeji Institute Of Technology Harima Science Garden City
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Katoh Sakae
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Koike Hiroyuki
Department Of Cardiovascular Surgery Japanese Red Cross Society Wakayama Medical Center
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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