Protein Phosphatases Ⅱ C in Plants are Involved in Abiotic Stress Tolerance of Several Signaling Pathways Research progress of plant PP2C-type protein phosphatase in ABA signal transduction and adversity stress regulation mechanism Activity of Serine/Threonine Protein Phosphatase Type-2C (PP2C) and Its Relationships to Drought Tolerance in Maize A Kelch Motif-Containing Serine/Threonine Protein Phosphatase Determines the Large Grain QTL Trait in Rice Protein Phosphatases and Signaling Cascades in Higher Plants Prokaryotic Expression and Polyclonal Antibodies Purification of Protein Phosphatase TOPP4 in Arabidopsis