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Short Communication

Apparent Bicarbonate Uptake and Possible Plasmalemma Proton Efflux in Chara corallina

Medical Research Council Group in Periodontal Physiology, University of Toronto, Toronto, Ontario M5S 1A8

It is shown that the apparent uptake of bicarbonate by cells of Chara corallina could be the result of a proton efflux coupled to extracellular production of CO₂ from bicarbonate, with CO₂ being taken up by the cell. The theoretical results presented here show that the influx of CO₂ across the plasmalemma can be much greater than previously thought, if there is a large efflux of protons across the plasmalemma, and that, if this occurs, there would be a much steeper gradient of pH near the cell surface than previously thought possible.