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分析了枯萎病菌侵染后棉苗叶 片和根茎部组织中超氧物歧化酶（ Ｓ Ｏ Ｄ）和过氧化氢酶 （ Ｃ Ａ Ｔ）活性的变化动态， 结果表明：抗病品种 和感病品种棉苗 中 Ｓ Ｏ Ｄ 和 Ｃ Ａ Ｔ 酶活性无显著 差异；氟乐灵处 理可诱发棉苗对枯萎病的诱导抗性，且氟乐灵处理的棉苗组织中 Ｓ Ｏ Ｄ 和 Ｃ Ａ Ｔ 酶活性无显著变化；枯萎病菌侵染后棉苗叶 片和根茎部组织 中 Ｓ Ｏ Ｄ 和 Ｃ Ａ Ｔ 酶活 性明显提 高，但抗病品 种棉苗组 织中 Ｓ Ｏ Ｄ 和 Ｃ Ａ Ｔ酶活性在前期 增加不显著，后期增 加较慢，而感病品 种棉苗中两种酶活 性在前期就明 显升高，增加 速度快；氟乐灵处理的棉苗，其组织中两种酶活性始终低于未处理棉苗 接种后的水平⒚棉花组织中的 Ｓ Ｏ Ｄ 酶主要是 Ｃｕ， Ｚｎ Ｓ Ｏ Ｄ，受侵后 Ｓ Ｏ Ｄ 酶活性的升高主要来自于 Ｃｕ ， Ｚｎ Ｓ Ｏ Ｄ⒚因此， Ｓ Ｏ Ｄ 和 Ｃ Ａ Ｔ 与棉花对枯萎病的抗性及由氟乐灵诱发的诱导抗性无关⒚
The dynamic changes of superoxide dismutase (SOD) and catalase (CAT) activity in leaves and rhizome tissues of Fusarium oxysporum f. Sp. Infection were analyzed. The results showed that the resistant varieties and susceptible varieties of cotton There was no significant difference in S O D and C A T enzyme activities in seedlings; trifluralin treatment could induce the resistance of cotton seedlings to Fusarium wilt, and S O D and C A T enzyme activities of Trifluralin-treated cotton seedlings No significant changes were observed. The activities of S O D and C A T in the leaves and rhizome tissues of cotton seedlings infected by Fusarium oxysporum were significantly increased, but the activities of SOD and C A T in the cotton seedlings were not increased in the early stage Significantly, the latter increased slowly, while the susceptible varieties of cotton seedlings in the two enzyme activity was significantly increased in the early stage, the rate of increase; Trifluralin treatment of cotton seedlings, the activity of the two enzymes is always lower than the untreated cotton The level of seedlings after inoculation S S O D enzymes in cotton tissue is mainly Cu, Zn S O D, S O D enzyme activity after invader increased mainly from Cu , Zn S O D ⒚ Therefore, S O D and C A T were not related to resistance to Fusarium wilt and induced resistance induced by trifluralin in cotton