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

AUTOR(ES)

Miller, Anthony G.

RESUMO

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.

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