Sn-1-specific phospholipase A1 involved in seed oil biosynthesis. Hydrolyzes polyunsaturated acyl groups from a unique chloroplast-specific phosphatidylglycerol (PG) that contains 16:1 delta 3-trans as its second acyl group. The polyunsaturated acyl groups released by PLIP1 are exported from the chloroplast, reincorporated into phosphatidylcholine (PC), and ultimately enter seed triacylglycerol (TAG). In vitro, possesses broad substrate specificity. Can hydrolyze the galactolipid monogalactosyldiacylglycerol (MGDG), and the phoshpolipids phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidic acid (PA), phosphatidylserine (PS) phosphatidylglycerol (PG) and phosphatidylinositol (PI). a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 2-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) a 1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol + 2 H2O = 3-beta-D-galactosyl-sn-glycerol + 2 a fatty acid + 2 H(+) Reduced levels of oil seeds and delay in seed germination. Plants overexpressing PLIP1 exhibit stunted growth and accumulate anthocyanin under normal growth conditions. Belongs to the AB hydrolase superfamily. Lipase family.