Abstract
Levels of polar lipids and the composition of fatty acids in individual classes of lipids were analyzed in vegetative cells of Chlamydomonas reinhardtii, grown either in air or in air supplemented with CO 2. The levels of monogalactosyl diacylglycerol (MGDG) and phosphatidylglycerol (PG) were markedly lower in the cells grown in 1% or 3% CO 2 than in the cells grown in air alone. The levels of unsaturated fatty acids in MGDG, PG, digalactosyl diacylglycerol (DGDG) and diacylglyceryltrimethylhomoserine (DGTS) were significantly lower in the cells grown in 1% or 3% CO 2, while the fatty acids in phosphatidylethanolamine (PE) were more unsaturated in these cells than in the cells grown in air. These results suggest that the metabolism of lipids is extensively modulated by CO 2.
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