Abstract

At low concentrations of inorganic carbon, unicellular algae and cyanobacteria require a ’Co2-concentrating’ mechanism to sustain high rates of photosynthesis. Air-grown cells of Synechococcus possess well-developed transport systems for Co2 and HCO3-. Hco3 - transport requires Na+ and is inhibited by Li+ whereas Co2 transport is not affected by either metal. Intracellular Co2 concentrations can be over 1000-fold higher than extracellular CO2 concentrations. High-Co3 grown Synechococcus has a well developed Co2 transport system that is dependent on Na+ and inhibited by Li. A Hco3 - transport system appears to be poorly developed. Standing culture cells of Synechococcus possess Co2 transport and Na+ dependent HCo3 - transport systems similar to those in air-grown cells, but also develop a Na+- independent HCo3 - transport system. The multiple transport systems may be indicative of the essentiality of these transport systems to the survival of the organism.

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