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分析了氟乐灵（２μｇ／ｇ土）诱发处理及枯萎病菌侵染后棉苗叶片和根茎部不同细胞定位过氧化物酶（ＰＯＤ）活性的变化．结果表明：（１）总可溶性ＰＯＤ、胞内ＰＯＤ、胞间ＰＯＤ以及细胞壁结合型ＰＯＤ的活性抗病品种高于感病品种；（２）氟乐灵诱发处理及枯萎病菌侵染可提高棉苗组织中上述五类ＰＯＤ的活性，细胞间隙ＰＯＤ及胞壁结合ＰＯＤ活性上升更为明显；（３）枯萎病菌侵染后经氟乐灵诱发处理并产生诱导抗性的棉苗及抗病品种棉苗中胞壁结合ＰＯＤ活性快速上升，增加幅度大，而感病品种前期无明显增加，后期才有较小幅度的上升．这说明过氧化物酶在棉苗对枯萎病的抗病性及由氟乐灵诱发的诱导抗性中起到重要作用
The changes of peroxidase (POD) activities in leaves and rhizomes of cotton seedlings induced by trifluralin (2μg / g soil) and Fusarium oxysporum f. Sp. Infection were analyzed. The results showed that: (1) the active resistant varieties of total soluble POD, intracellular POD, intercellular POD and cell wall-bound POD were higher than susceptible cultivars; (2) Trifluralin-induced treatment and Fusarium wilt infection could increase cotton seedling The activities of these five PODs, the POD of cell gap and the POD activity of cell wall increased obviously in the tissues. (3) Cotton plants and resistant varieties that induced by Flos Lactil Cell wall POD activity in seedling cells rapidly increased with a large increase, while no significant increase in susceptible varieties early stage, only a small increase. This indicates that peroxidase plays an important role in the resistance of cotton seedlings to Fusarium wilt and induced resistance induced by trifluralin