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

Anthony G. Miller | Zendy; George S. Espie | Zendy; David T. Canvin | Zendy

Open Access

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

Author(s) -

Anthony G. Miller,

George S. Espie,

David T. Canvin

Publication year - 1988

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.88.1.6

Subject(s) - fluorometer , synechococcus , chemistry , photosystem ii , total inorganic carbon , photochemistry , photosynthesis , electron transport chain , chlorophyll a , electron acceptor , carbon fixation , quenching (fluorescence) , fluorescence , cyanobacteria , carbon fibers , iodoacetamide , acceptor , carbon dioxide , biochemistry , biology , materials science , bacteria , physics , organic chemistry , cysteine , enzyme , genetics , condensed matter physics , quantum mechanics , composite number , composite material

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.

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