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SUMMARY: The growth rate of Dunaliella salina was optimal in the presence of 2·5 to 5% (w/v) NaCl and growth continued up to 30% NaCl. The carotene to chlorophyll ratio gradually increased from about 1·1 at 2·5% NaCl to 7·7 at 30% NaCl and the chloroplast showed some degeneration; however, with 30% NaCl, intact thylakoids were still recognized. The total lipid content of the cells decreased with increasing salinity but the major lipid classes in all extracts were monogalactosyldiacylglycerols, digalactosyldiacylglycerols, sulphoquinovosyldiacylglycerols and phosphatidylglycerols. Considerable proportions of diacylglycerotrimethylhomoserines were also present, whereas the proportions of phosphatidylcholines and phosphatidylethanolamines were relatively low. Increasing the salinity of the medium resulted in a large increase in the proportions of constituent linolenic acid (18:3) both in total lipids and in the galactolipids and of palmitoleic acid (16:1) in phosphatidylglycerols. The results are discussed in view of the probable relation of chloroplast lipids to photosynthetic activity, and the fact that the osmoregulator glycerol is produced via photosynthesis.

Correlative Changes of Growth, Pigmentation and Lipid Composition of Dunaliella salina in Response to Halostress