低温下外源水杨酸对玉米幼苗保护酶活性的影响  

Effects of Salicylic Acid on the Cell Defense Enzymes of Maize Seedlings During Chilling Stress

作　　者：张富平[1] 张蕊[1] 

机构地区：[1]周口职业技术学院生物工程系,河南周口466000

出　　处：《玉米科学》2007年第4期83-85,共3页Journal of Maize Sciences

摘　　要：0.5mmol/L水杨酸(SA)预处理玉米幼苗降低了低温胁迫期间玉米幼苗体内丙二醛(MDA)的含量及超氧阴离子(O2-.)的产生速率。酶活性分析表明,SA预处理后玉米幼苗在低温胁迫下超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性较低温对照高。常温下用0.5mmol/LSA预处理玉米幼苗,提高了保护酶的活性,从而提高了玉米幼苗的抗寒性。0.5 mmol/L SA pretreatment decreased malondialdehyde（MDA） concentration and production rates of superoxide anion radicals（O2-） in maize seedlings under chilling stress. The analysis of antioxidant enzymes showed that SA pretreatment caused decreases in superoxide dismutase（SOD）activity, peroxidase（POD） activity and catalase（CAT） activity. It is suggested that the pretreatment of maize seedlings with SA under normal growth temperature may increase the activities of cell defense enzymes which lead to increased chilling tolerance.

关 键 词：玉米幼苗 低温 水杨酸 保护酶活性 

分 类 号：S513.01[农业科学—作物学]