SINGLET OXYGEN IS NOT PRODUCED IN PHOTOSYSTEM I UNDER PHOTOINHIBITORY CONDITIONS

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Abstract

Abstract— Excess illumination of photosynthetic systems brings about the complex functional and structural damage known as photoinhibition. According to the generally accepted and experimentally confirmed model, photoinhibition involves singlet oxygen production and subsequent oxidative damage in the photosystem II reaction center. However, it was recently suggested that singlet oxygen is not necessarily produced in photosystem II itself but rather in the non‐heme iron‐containing Fe‐S centers of photosystem I (Chung, S.K. & J. Jung, Photochem. Photobiol. 61, 383–389, 1995). Contrary to this suggestion, our electron paramagnetic resonance spectroscopy experiments with the singlet oxygen trap 2,2,6,6‐tetramethylpiperidine demonstrate that under photoinhibitory conditions, singlet oxygen is present in thylakoids and photosystem II core complex preparations but is not produced in photosystem I particles.

Original languageEnglish
Pages (from-to)949-952
Number of pages4
JournalPhotochemistry and photobiology
Volume62
Issue number5
DOIs
Publication statusPublished - Nov 1995

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ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

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