Effect of chilling stress on cold-resistance of acer negundo L. ‘Qingzhu＇

By Chilling stress,the change of some physiological traits of Acer negundo L.'Qingzhu' blades was studied.The results showed that the activities of SOD and POD were increased early and decreased later;the content of MDA and relative conductance showed an increased in CK and CaCl2 sprayes.After the stress disarm,the activities of SOD and POD were increased,the content of MDA and relative conductance were droped to the normal-growth level of plant.The results show that,Acer negundo L.Qingzhu' can grown normaly in 24 ℃ environment,having longtime low-temperature of endurance;and spray CaCl2 can grown resistance.