OXYGEN QUENCHING OF CHLOROPHYLL FLUORESCENCE IN CHLOROPLASTS |
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| Authors: | William Vidaver Radovan Popovic Douglas Bruce Konrad Colbow |
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| Institution: | Photobiology Group, Departments of Physics and Biological Sciences, Simon Fraser University, Burnaby, B.C., V5A 1S6 Canada |
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| Abstract: | Abstract— Three phases of chlorophyll a fluorescence quenching by O2 are observed in green plants. The effects of various inhibitors on photosynthetic partial processes in chloroplasts were investigated in attempts to (1) localize the O2-quenching sites and (2) assess possible physiological significance of O2-quenching. Our results localize the most sensitive (and presumably functionally important) phase to a site between plastoquinone and the photosystem I acceptor, chlorophyll (P700), possibly plastocyanin. It is suggested that PC may transfer electrons to oxygen in addition to P700. |
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