低温胁迫及CaCl_2处理对青竹复叶槭抗寒指标的影响

Effect of Chilling Stress on Cold-Resistance of Acer negundo L. 'Qingzhu'

以青竹复叶槭叶片为材料,测定了不同低温处理下细胞超氧化物歧化酶(SOD)和过氧化物酶(POD)活性,丙二醛(MDA)含量及叶片相对电导率的变化。结果显示:随温度的降低,CaCl2处理的青竹复叶槭SOD,POD活性先升高后降低,且高于同期对照;MDA含量和相对电导率呈上升趋势,上升比率逐渐增大。胁迫解除后,两种酶活性有所回升,MDA含量和相对电导率下降至植物正常生长水平。表明青竹复叶槭在经历短暂的-24℃低温后还可以维持生长,具有较好的抗寒能力;外施CaCl2还可帮助青竹复叶槭抵御低温逆境。

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, Aeer negundo L. Qingzhu can grown normaly in 24 ℃ environment, having longtime low-temperature of endurance; and spray CaCl2 can grown resistance.