PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. Releases lysophospholipids (LPLs) and free fatty acids (FFAs) from membrane phospholipids in response to hormones and other external stimuli. Modulates the trafficking of PIN proteins to the plasma membrane (PubMed:16140037, PubMed:20525850). Negatively regulates MYB30 transcriptional activity and hypersensitive response control (PubMed:20696912). a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion per subunit. Optimum pH is 8.5-9. Optimum temperature is 30-40 degrees Celsius. Interacts with MYB30. Relocalization from cytoplasmic vesicles to nucleus is MYB30-mediated. Ubiquitous but expressed at a low level. Induced 6 hours post pathogen infection in the area immediately neighboring the inoculated zone. The enzyme has a preference towards linoleoyl acyl chain over palmitoyl acyl chain. It also has a slight preference for phosphatidylethanolamine over phosphatidylcholine. Belongs to the phospholipase A2 family.