Genetic decrease in fatty acid unsaturation of phosphatidylglycerol increased photoinhibition of photosystem i at low temperature in tobacco leaves

A. G. Ivanov, S. I. Allakhverdiev, N. P.A. Huner, N. Murata

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Leaves of transgenic tobacco plants with decreased levels of fatty acid unsaturation in phosphatidylglycerol (PG) exhibited a slightly lower level of the steady state oxidation of the photosystem I (PSI) reaction center P700 (P700+) than wild-type plants. The PSI photochemistry of wild-type plants was only marginally affected by high light treatments. Surprisingly, all plants of transgenic lines exhibited much higher susceptibility to photoinhibition of PSI than wild-type plants. This was accompanied by a 2.5-fold faster re-reduction rate of P700+ in the dark, indicating a higher capacity for cyclic electron flow around PSI in high light treated transgenic leaves. This was associated with a much higher intersystem electron pool size suggesting over-reduction of the PQ pool in tobacco transgenic lines with altered PG unsaturation compared to wild-type plants. The physiological role of PG unsaturation in PSI down-regulation and modulation of the capacity of PSI-dependent cyclic electron flows and distribution of excitation light energy in tobacco plants under photoinhibitory conditions at low temperatures is discussed. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.

Original languageEnglish
Pages (from-to)1374-1379
Number of pages6
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1817
Issue number8
DOIs
Publication statusPublished - Aug 1 2012

Keywords

  • Cold stress
  • Electron transport
  • Lipid unsaturation
  • Phosphatidylglycerol
  • Photoinhibition
  • Photosystem I

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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