Abstract
Lamprothamnium is found in salinities varying from nearly fresh to twice sea water in coastal saline lakes in South Australia, Victoria, and New South Wales. It maintains its turgor (ΔP≅ΔII) approximately constant over this range, varying internal osmotic pressure by altering KCl concentration (although at the highest salinity, Na+ concentration became more important). The ability to regulate turgor with alterations in salinity is wide-spread in marine algae, but has not been reported for the freshwater charophytes. Lamprothamnium is also unusual among algae and particularly among charophytes in having a high concentration of sucrose (up to 300 mM) in the vacuole. Vacuolar concentration is not correlated with salinity and its adaptive significance is not known, although in the cytoplasm sucrose may play a significant role in osmotic adaptation.
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