Hydrolyzes glycerol-phospholipids at the terminal phosphodiesteric bond to generate phosphatidic acids (PA). Plays an important role in various cellular processes, including phytohormone action, vesicular trafficking, secretion, cytoskeletal arrangement, meiosis, tumor promotion, pathogenesis, membrane deterioration and senescence. Involved in regulating stomatal movement and plant-water status (PubMed:11722757). Can use phosphatidylserine (PS) and phosphatidylethanolamine (PE) as substrates only in the presence of PIP2. Can use phosphatidylcholine (PC), phosphatidylglycerol (PG) or N-acylphosphatidylethanolamine (NAPE) as substrates in the presence of PE and PIP2 (PubMed:9578608). Modulates defense responses to bacterial and fungal pathogens (PubMed:23577648). a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1,2-diacyl-sn-glycero-3-phosphate + choline + H(+) Ca(2+). Requires micromolar level (PIP2-dependent). Inhibited by neomycin. Up-regulated by PIP2 binding. Optimum pH is 6.5 to 7.5. Expressed in stems, and to a lower amount in leaves, flowers and siliques. Activated by wounding, methyl jasmonate, heavy metal, osmotic and salt stresses. C2 domain is a calcium-binding fold, and the binding induces conformational changes, promoting the protein association with membranes. These conformational changes occure at micromolar Ca(2+) concentrations. Exhibits three Ca(2+)-binding sites. Binds also PIP2. Belongs to the phospholipase D family. C2-PLD subfamily. Truncated N-terminus. Sequencing errors.