論文

査読有り
2002年2月

Regulation of proton-to-electron stoichiometry in photosynthetic electron transport: physiological function in photoprotection

JOURNAL OF PLANT RESEARCH
  • T Shikanai
  • ,
  • Y Munekage
  • ,
  • K Kimura

115
1117
開始ページ
3
終了ページ
10
記述言語
英語
掲載種別
DOI
10.1007/s102650200001
出版者・発行元
SPRINGER-VERLAG TOKYO

The primary stable products of photosynthetic electron flow are NADPH and ATP. Stoichiometry of their production depends on the ratio of protons pumped across the thylakoid membrane to electrons passed through the electron transport pathway (H+/e(-) ratio). Flexible requirements of the ATP/NADPH ratio by various assimilatory reactions in chloroplasts must be fulfilled by the H+/e(-) ratio during the electron flow. In addition to the well-known role of DeltapH during ATP synthesis, DeltapH also functions as a trigger of the down-regulation of photosystem II (PSII) photochemistry. Excessive light energy is safely dissipated as heat by this regulatory process to suppress the generation of toxic reactive oxygen species. Thus, regulation of the H+/e(-) ratio may function in the photoprotection. as well as in the regulation of the ATP/NADPH production ratio. It has long been the consensus that the H+/e(-) ratio can be controlled by regulating the proton-transporting Q-cycle in the cytochrome b(0)f complex and by the cyclic electron flow around photosystem I (PSI). Despite the possible physiological importance and the long history of interest, the molecular identity of Q-cycle regulation and the cyclic electron flow around PSI have been remained unclear. The recent improvements in research tools, including the Genetic approach using chlorophyll fluorescence imaging and establishment of the chloroplast transformation technique, are providing new insights into classical topics. In this review, we focus on regulation of the H+/e(-) ratio especially from the view of photosynthetic regulation.

リンク情報
DOI
https://doi.org/10.1007/s102650200001
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/12884042
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000174048700002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s102650200001
  • ISSN : 0918-9440
  • PubMed ID : 12884042
  • Web of Science ID : WOS:000174048700002

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