PH-Dependent regulation of electron transport and ATP synthesis in chloroplasts

Research output: Contribution to journalReview article

90 Citations (Scopus)

Abstract

This review is focused on pH-dependent mechanisms of regulation of photosynthetic electron transport and ATP synthesis in chloroplasts. The light-induced acidification of the thylakoid lumen is known to decelerate the plastoquinol oxidation by the cytochrome b 6 f complex, thus impeding the electron flow between photosystem II and photosystem I. Acidification of the lumen also triggers the dissipation of excess energy in the light-harvesting antenna of photosystem II, thereby protecting the photosynthetic apparatus against a solar stress. After brief description of structural and functional organization of the chloroplast electron transport chain, our attention is focused on the nature of the rate-limiting step of electron transfer between photosystem II and photosystem I. In the context of pH-dependent mechanism of photosynthetic control in chloroplasts, the mechanisms of plastoquinol oxidation by the cytochrome b 6 f complex have been considered. The light-induced alkalization of stroma is another factor of pH-dependent regulation of electron transport in chloroplasts. Alkalization of stroma induces activation of the Bassham-Benson-Calvin cycle reactions, thereby promoting efflux of electrons from photosystem I to NADP+. The mechanisms of the light-induced activation of ATP synthase are briefly considered.

Original languageEnglish
Pages (from-to)511-534
Number of pages24
JournalPhotosynthesis Research
Volume116
Issue number2-3
DOIs
Publication statusPublished - May 23 2013
Externally publishedYes

Keywords

  • Chloroplasts
  • Electron transport
  • Photosynthesis
  • pH-Dependent regulation

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

Fingerprint Dive into the research topics of 'PH-Dependent regulation of electron transport and ATP synthesis in chloroplasts'. Together they form a unique fingerprint.

  • Cite this