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２μｇ＿ａ．ｉ／ｇ土壤的氟乐灵作播前土壤处理可诱发棉苗对枯萎病的诱导抗性，处理组棉苗枯萎病的株发病率和病情指数明显降低。对棉苗叶片和根茎部组织中总糖、可溶性糖及还原糖含量以及蔗糖酶活性的测定结果表明，抗病品种棉苗中总糖、可溶性糖和还原糖含量以及蔗糖酶活性均低于感病品种棉苗中的含量和活性。接种枯萎病菌后，两个品种棉苗叶片及根茎部组织中糖含量和酶活性有明显的提高，但抗病品种和感病品种棉苗之间糖含量及酶活性的变化无显著差异。氟乐灵诱发处理的棉苗中糖含量和酶活性均高于对照，但枯萎病菌侵染后氟乐灵诱发处理和未处理棉苗中糖含量的变化也无明显差异。因此，受侵后糖含量和蔗糖酶活性的提高与棉苗对枯萎病的抗病性及氟乐灵诱发产生的诱导抗性无直接关系。
2μg_a. Trefoil in i / g soil before sowing pre-sowing could induce the resistance of cotton seedlings to Fusarium wilt, and the morbidity and disease index of cotton seedlings were significantly decreased. The contents of total sugar, soluble sugar, reducing sugar and sucrase activity in leaves and rhizome tissues of cotton seedlings showed that the content of total sugar, soluble sugar and reducing sugar, and invertase activity in resistant cotton seedlings were lower than those in susceptible cotton The content and activity of the diseased cotton seedlings. After inoculation with Fusarium oxysporum f. Sp., The content of sugar and enzyme activity in leaves and rhizome tissues of cotton cultivars increased obviously. However, there was no significant difference in the content of sugar and enzyme between cotton cultivars and susceptible varieties. The contents of sugar and enzyme in cotton seedlings treated with trifluralin were higher than those in the control, but there was no significant difference in the content of sugar between the triflumuron-treated and the untreated cotton seedlings. Therefore, the increase of sugar content and sucrase activity after invaded was not directly related to the resistance of cotton seedlings to Fusarium wilt and induced resistance induced by trifluralin.