[Objective]The aim was to provide the reference for the study on cold resistance of landscape plants.[Method]With leaves of Pinus tabulaeformis var.mukdensis Uyeki and Pinus armandii Franch in low temperature treatments as the materials,the activities of their protective enzymes were studied with the method of polyacrylamide vertical slab electrophoresis in discontinuous system.[Result]Under low temperature stress of-40 ℃,POD isozyme of P.armandii had 2 isozyme bands(containing 1 new No.2 band),and that of ...