Simultaneous Transport of CO2 and HCO3− by the Cyanobacterium Synechococcus UTEX 625 | Zendy

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

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Simultaneous Transport of CO₂ and HCO₃⁻ by the Cyanobacterium Synechococcus UTEX 625

Author(s) -

George S. Espie,

Anthony G. Miller,

Douglas G. Birch,

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.87.3.551

Subject(s) - photosynthesis , synechococcus , cyanobacteria , chemistry , mass transport , photosystem ii , diffusion , environmental chemistry , analytical chemistry (journal) , biochemistry , physics , bacteria , biology , engineering physics , genetics , thermodynamics

A mass spectrometer was used to simultaneously follow the time course of photosynthetic O(2) evolution and CO(2) depletion of the medium by cells of the cyanobacterium Synechococcus leopoliensis UTEX 625. Analysis of the data indicated that both CO(2) and HCO(3) (-) were simultaneously and continuously transported by the cells as a source of substrate for photosynthesis. Initiation of HCO(3) (-) transport by Na(+) addition had no effect on ongoing CO(2) transport. This result is interpreted to indicate that the CO(2) and HCO(3) (-) transport systems are separate and distinctly different transport systems. Measurement of CO(2)-dependent photosynthesis indicated that CO(2) uptake involved active transport and that diffusion played only a minor role in CO(2) acquisition in cyanobacteria.

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