低温胁迫下钼对冬小麦抗氧化酶活性的影响

Effects of molybdenum on antioxidative enzymes in winter wheat (Mo efficient cv. 97003 and Mo inefficient cv. 97014) were investigated under low temperature stress. The results showed that the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and ascorbate peroxidase (APX) increased and the production rates of O2－。free radicals decreased in Mo-treated winter wheat under low temperature stress. With the prolongation of low temperature stress, the activities of the four antioxidative enzymes increased at first 2 or 4 days of low temperature stress, and then decreased or dropped drastically in Mo-treated winter wheat, which indicated a valid cold acclimation were experienced in the Mo-treated winter wheat and it helped to maintain the higher level of cold resistance under the following durative low temperature stress. Genotypic differences in response of activities of molybdenum on antioxidative enzymes were found in Mo efficient cv. 97003 and Mo inefficient cv. 97014. The decrease rates of the SOD, CAT, POD and APX activities and the accumulative rate of O2－。free radicals for -Mo treatment in Mo inefficient cv. 97014 were higher than those in Mo efficient cv. 97003, which maybe one of the reasons why the cold injury happened frequently in Mo inefficient cultivar for the Mo deficient treatment.