Ion and Glycerol Concentrations in 12 Isolates ofDunaliella

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Abstract
Ginzburg, M., and Ginzburg, B. Z., 1985. Ion and glycerol concentrations in 12 isolates of Dunaliella.—J. exp. Bot. 36: 1064–1074. Twelve isolates of Dunaliella with average cell volumes ranging from 50 to 1400×10−18 m3 were grown in batch culture at 0.5 M or 2.0 M NaCl. Glycerol and ions (Na+, K+, Mg2+, CI−, phosphate) were measured in log-phase cultures. The contents of Mg2+, K+ and phosphate per cell were found to be a function of cell-volume. Cell glycerol, Na+ and Cl− were functions of cell-volume and of the NaCl concentration in the medium. Solute concentrations were calculated from the measured cell-volumes and from the 3H2O content of pellets corrected for intercellular space using Blue Dextran. Cell glycerol was found to account for about one-half of the expected osmolarity, the remainder being largely accounted for by Na+ and CI−.

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