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Chlorophyll a fluorescence of Synechococcus UTEX 625 was quenched during the transport of inorganic carbon, even when CO(2) fixation was inhibited by iodoacetamide. Measurements with a pulse modulation fluorometer showed that at least 75% of the quenching was due to oxidation of Q(a), the primary acceptor of photosystem II. Mass spectrometry revealed that transport of inorganic carbon increased the rate of O(2) photoreduction. Hence, O(2) could serve as an electron acceptor to allow oxidation of Q(a) even in the absence of CO(2) fixation.

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

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