Abstract
Summary It has previously been demonstrated that changes in the concentration of isofloridoside represent the main regulatory mechanism for the maintenance of osmotic balance in Ochromonas . We now report that in addition to regulation by isofloridoside, a definite increase in the cellular potassium content occurs after an increase in external osmotic pressure. In most experiments, the increase in potassium plus its counter ion is 10–30% of the observed solute increase, but in exceptional cases the increase amounted to 50%. The time course of potassium and isofloridoside accumulation suggest that the two mechanisms operate independently of each other.
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