May play a role in plant defense signaling (Probable). Does not bind to phospholipids in a Ca(2+)-dependent manner in vitro (PubMed:21756975). Does not translocate to plasma membrane upon fungal elicitor or calcium treatment. Expressed in phloem. By fungal elicitor and calcium. Phosphorylated at Ser-40 by CPK18 in a calcium-dependent manner.