Comparison of Cytoplasmic pH and Cl− Influx in Cells of Chora corallina Following ‘C1− Starvation’

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Abstract
Cytoplasmic pH and C1− influx in cells of Chara corallina have been measured following pretreatment in C1− free solutions (‘C1− starvation’) or in control solutions containing C1−. Influx of C1− was greatly increased following starvation for 3—24 h, but significant changes in cytoplasmic pH were only detected after 23—24 h. It is thus unlikely that increased cytoplasmic pH controls Cl-influx in the early stages of Cl—starvation. Addition of NH+4 also increased Cl- influx, both in non-starved cells and (sometimes) in Cl-starved cells, and this effect was accompanied by an increase in cytoplasmic pH. The possible significance of the cytoplasmic pH and CI- concentration as factors controlling CI- influx in Chara are assessed.