The Photoinhibition Site of Photosystem I in Isolated Chloroplasts under Extremely Reducing Conditions

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概要

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• Under anaerobic atmosphere where the gas phase was simply replaced by N_2, photo-inhibition of PS I of isolated spinach chloroplasts was insignificant. However, when dithionite was included in the irradiation mixture, severe photoinhibition of the NADP^+ and the MV photo-reduction occurred. Neither P700 determined by continuous illumination-induced difference spectroscopy. Fe-S centers determined by EPR under cryogenic temperatures, nor vitamin K-1 determined by HPLC analysis were significantly decreased under these photoinhibition conditions. Although photobleaching of antenna chlorophylls occurred to more or less extent, NADP^+ photoreduction activities were markedly depressed even under saturating actinic light. The maximal amplitude of the flash induced absorbance changes of P700 in ms range decreased almost in parallel with the loss of NADP^+ photoreduction activity. These results indicate that although the Fe-S centers of the photoinhibited chloroplasts were reducible by continuous illumination, to almost the same extents as that of the control chloroplasts, the efficiency of reduction by each flash was much lower than that of the control chloroplasts. The site of photo-inhibition in PS I under extremely reducing conditions is between A_0 and Fe-S X.

• 日本植物生理学会の論文

著者

• Fujii Tsutomu

  Department Of Surgery Ii Nagoya University Graduate School Of Medicine

• Fujii T

  Univ. Tsukuba Ibaraki Jpn

• Inoue Kaori

  Department Of Cell Biology National Institute For Basic Biology:department Of Molecular Biomechanics

• Inoue Kazuhito

  Department of Biology, School of Education, Waseda University

• Yokoyama Eiichi

  Department of Biology, School of Education, Waseda University

• Matsuura Katsumi

  Department of Biology, Faculty of Sciences, Tokyo Metropolitan University

• Hiyama Tetsuo

  Department of Biochemistry, Faculty of Sciences, Saitama University

• Sakurai Hidehiro

  Department of Biology, School of Education, Waseda University

• Matsuura Katsumi

  Department Of Biology Faculty Of Sciences Tokyo Metropolitan University

• Matsuura Katsumi

  Department Of Biology Faculty Of Science Tokyo Metropolitan University

• Inoue K

  Department Of Cell Biology National Institute For Basic Biology:department Of Molecular Biomechanics

• Fujii Tsutomu

  Department Of Biology School Of Education Waseda University

• Hiyama Tetsuo

  Department Of Biochemistry Faculty Of Sciences Saitama University

• Hiyama T

  Department Of Biochemistry And Molecular Biology Saitama University

• Inoue Kazuhito

  Department Of Biological Sciences Graduate School Of Science University Of Tokyo

• Sakurai H

  Osaka Univ. Osaka

• Sakurai Hidehiro

  Department Of Applied Chemistry Graduate School Of Engineering Osaka University

• Yokoyama E

  Waseda Univ. Tokyo Jpn

• Yokoyama Eiichi

  Department Of Biology School Of Education Waseda University

• Sakurai Hidehiro

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Matsuura Katsumi

  Department Of Biological Sciences Tokyo Metropolitan University

• Hiyama Tetsuo

  Department of Biochemistry and Molecular Biology, Saitama University

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