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OXYGEN QUENCHING OF CHLOROPHYLL FLUORESCENCE IN CHLOROPLASTS
Author(s) -
Vidaver William,
Popovic Radovan,
Bruce Douglas,
Colbow Konrad
Publication year - 1981
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.1751-1097.1981.tb09053.x
Subject(s) - plastoquinone , quenching (fluorescence) , photosystem ii , plastocyanin , chlorophyll fluorescence , chloroplast , photochemistry , light harvesting complexes of green plants , chlorophyll , photosynthesis , acceptor , oxygen , fluorescence , chemistry , chlorophyll a , electron acceptor , oxygen evolution , photosystem i , thylakoid , botany , biology , biochemistry , physics , optics , condensed matter physics , electrochemistry , organic chemistry , electrode , gene
Abstract— Three phases of chlorophyll a fluorescence quenching by O 2 are observed in green plants. The effects of various inhibitors on photosynthetic partial processes in chloroplasts were investigated in attempts to (1) localize the O 2 ‐quenching sites and (2) assess possible physiological significance of O 2 ‐quenching. Our results localize the most sensitive (and presumably functionally important) phase to a site between plastoquinone and the photosystem I acceptor, chlorophyll (P 700 ), possibly plastocyanin. It is suggested that PC may transfer electrons to oxygen in addition to P 700 .