Abstract
Phosphatidylglycerol (PG) is a phospholipid characteristic of chloroplasts of higher plants. Molecular species of PG isolated from leaves of 7 Citrus species were examined and grouped into 5 classes. More than 90% of the total molecules were of the prokaryotic type synthesized in chloroplasts. Fatty acid compositions (sn-1/sn-2) of the major molecular species were 18:1/16:1 (26-47% of the total molecules), 18:1/16:0 (11-35%), and 16:0/16:1 (10-22%), which were all prokaryotic. Molecular species with 18:1 at sn-1 were characteristic of Citrus leaf PG. Unsaturated prokaryotic molecular species of (18:1, 18:2, and 18:3)1(16:0 and 16:1) accounted for 65-82%, and saturated ones of (16:0 and 18:0)/(16:0 and 16:1) for 19-32%.
