Abstract
Chloroplasts and mitochondria were isolated in pure form from pea leaves and used for a comparison of membrane lipids. Three phospholipids present in both organelles (i.e. phosphatidylcholine, -inositol and -glycerol) showed a lipid as well as an organelle-specific fatty acid profile. Phosphatidylglycerol was subjected to an analysis of positional distribution and pairing of fatty acids. The chloroplast phospholipid contained only molecules of procaryotic C 18/C 16 pairing type, whereas the lipid of mitochondrial origin was a mixture of C 18/C 16, C 16/C 18 and C 18/C 18 pairings in the approximate proportions of 43, 32 and 25%, respectively. The pool of C 18/C 18 pairings may represent a source for cardiolipin biosynthesis.
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