Protein phosphatase that modulates defense response to pathogenic bacteria, conferring resistance and promoting salicylic acid (SA) accumulation. H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Binds 2 magnesium or manganese ions per subunit. Inhibited by sodium fluoride (NaF). Interacts with the Pseudomonas syringae pv. maculicola effector HopW1-1 (via C-terminus). Belongs to the PP2C family.