LIPID AND FATTY-ACIDS COMPOSITION OF PHOTOAUTOTROPHICALLY AND HETEROTROPHICALLY GROWN CHLAMYDOMONAS-REINHARDTII

Monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGD G), phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphat idylinositol (PI) and sulfoquinovosyl diacylglycerol (SQDG) are the mo st abundant lipid classes present in both the autotrophically and hete rotrophically grown Chlamydomonas reinhardtii. However, phosphatidylch oline (PC) and diacylglycerol (N,N,N-trimethyl)-homoserine (DGTS) were absent in both alga types. The polyne index B was higher in heterotro phic than photoautotrophic algae, but the unsaturation index was highe r in photoautotrophic algae PI, PE and DGDG. The proportion of linolen ic acid decreased under heterotrophy with compensatory increases in he xadecadienoic (16 : 3), oleic (18 : 1) and linoleic (18 : 3) acids.