枯萎病菌对西瓜不同抗感品种丙二醛含量及某些保护酶活性的影响

EFFECTS OF Fusarium oxysporum ON CONTENT OF MDA AND PROTECTIVE ENZYME ACTIVITIES IN DIFFERENT CULTIVARS OF WATERMELON

本文以西瓜为材料 ,研究了西瓜苗期感染枯萎病菌 ( Fusarium oxysporum Schlecht.)后根部细胞内丙二醛含量、超氧化物歧化酶和过氧化氢酶活性的动态变化。结果表明 ,受枯萎病菌侵染的幼苗细胞内 MDA含量的增加比率 ,抗病品种克伦生低于感病品种早花 ;SOD酶活性的下降比率 ,抗病品种克伦生低于感病品种早花 ;CAT酶活性增减的幅度 ,抗病品种克伦生低于感病品种早花。抗病品种克伦生在染病后的短时间内 ( 4 8h左右 )能使细胞内 MDA、SOD酶和 CAT酶的代谢基本恢复到正常状态 ,其自我调节和恢复正常状态的能力显著大于感病品种早花。

The dynamic changes in content of malonaldehyde (MDA), superoxide dismutase (SOD) and catalase (CAT ) caused by infection Fusarium oxysporum Schlecht.in root cells of watermelon at seedling stage were studied. After infection, Kelunsheng, a resistant cultivar, showed a lower increasing rate of MDA content in cells of seedling than Zaohua, a susceptible cultivar. The resistant cultivar showed a lower decrease rate of SOD activity than the susceptible. Smaller change in CAT activity occurred in the resistant than the susceptible. The resistant cultivar, Kelunsheng, resumed basic normal metabolisms of MDA, SOD and CAT within a shorter time (48 hr). It demonstrated that Kelunsheng possessed a significantly larger self regulating ability than Zaohua.