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Plant Physiology 88:6-9 (1988)
© 1988 American Society of Plant Biologists

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Membranes and Bioenergetics

Active Transport of Inorganic Carbon Increases the Rate of O2 Photoreduction by the Cyanobacterium Synechococcus UTEX 625 1

Anthony G. Miller, George S. Espie and David T. Canvin

Department of Biology, Queen's University, Kingston, Ontario, Canada, K7L 3N6

Chlorophyll a fluorescence of Synechococcus UTEX 625 was quenched during the transport of inorganic carbon, even when CO2 fixation was inhibited by iodoacetamide. Measurements with a pulse modulation fluorometer showed that at least 75% of the quenching was due to oxidation of Qa, the primary acceptor of photosystem II. Mass spectrometry revealed that transport of inorganic carbon increased the rate of O2 photoreduction. Hence, O2 could serve as an electron acceptor to allow oxidation of Qa even in the absence of CO2 fixation.

1 Supported by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC) to D. T. C. and an NSERC postdoctoral fellowship to G. S. E.




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