Abstract
Summary Tolypothrix ceylonica, Hapalosiphon intricatus, and two species of Calothrix (C. braunii and C. membranacea) showed absorption of sodium > 0.8 μg/mg algae dry wt., grown in a medium containing 1.425 mg Na/ml. These species of blue-green algae synthesized less biomass as compared to the species of Scytonema, Nostoc, Calothrix, and Aulosira. On supplementing the medium with graded concentration of potassium, a reduced Na/K ratio was observed, and the biomass production increased as the concentration of potassium increased up to a limit of 0.13 mg K/ml. No definite trend with protein synthesis could be observed.
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