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SINGLET OXYGEN IS NOT PRODUCED IN PHOTOSYSTEM I UNDER PHOTOINHIBITORY CONDITIONS
Author(s) -
Hideg ÉVa,
Vass Imre
Publication year - 1995
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1995.tb09162.x
Subject(s) - photosystem ii , photoinhibition , photochemistry , singlet oxygen , photosynthetic reaction centre , chemistry , photosystem i , oxygen evolving complex , oxygen , p700 , photosynthesis , thylakoid , electron transfer , chloroplast , biochemistry , organic chemistry , gene
— 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.