Photoinhibition of Reaction Centers of Photosystems I and II in Intact Bryopsis Chloroplasts under Anaerobic Conditions

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Abstract
Illumination of intact B. corticulans chloroplasts under anaerobic conditions induced a decline of chlorophyll [chl] fluorescence and photoinhibition of photosystems [PS] I and II. The time course of the light-induced decline of Chl fluorescence and the decreases of activities of reactions sensitized by PS I and II were compared. PS I activity decreased in parallel with the disappearance of active P700. The time course of the destruction of the reaction center of PS II was similar to that of photoinhibition of 2,6-dichlorophenolindophenol-Hill reaction. Apparently, the initial events in photoinhibition are the destruction of the reaction centers of PS I and II and the reaction centers that are inhibited become quenchers of Chl fluorescence. Effects of inhibitors of electron transfer and of an electron donor to PS I showed that photoinhibition was related to PS I activity.