Acylhydrolase that catalyzes the hydrolysis of phosphatidylcholine at the sn-1 position. Has a strong galactolipase activity toward digalactosyldiacylglycerol (DGDG). Hydrolyzes triacylglycerol (TAG), but has a low activity toward phosphatidylcholine (PC) and monogalactosyldiacylglycerol (MGDG). Ubiquitous. Hihgest expression in flowers and seedlings. Not induced by wounding. No visible phenotype under standard growth phenotype. Belongs to the AB hydrolase superfamily. Lipase family.