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Is HCO₃^– Transport in Anabaena a Na⁺ Symport? ¹

Department of Botany, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel

Na⁺ strongly promoted HCO₃^– transport in Anabaena variabilis. The effect was highly specific to this cation. Kinetic analysis indicated a progressive decrease in the K_m (HCO₃^–) of the transport system with increasing Na⁺ concentration. V_max was also affected. We raise the possibility that the transport is a Na⁺-HCO₃^– symport; alternatively, that a Na⁺-H⁺ antiport (or Na⁺-OH⁺ symport) system mediates the efflux of the OH^– ions derived from the entering HCO₃^– ions, and that this antiport can rate-limit HCO₃^– influx.

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