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用不同抗雪霉叶枯病的小麦品种，分别接种雪霉叶枯菌粗毒素液和分生孢子，测定了小麦叶内苯丙氨酸解氨酶（ＰＡＬ）活性的变化，初步讨论了毒素在病害发生过程中的致病机理。结果表明：粗毒素液和分子孢子都有提高ＰＡＬ活性的作用，但二者刺激的强度不同，毒素处理大于分生孢子接种，抗病品种大于感病品种。测定不同浓度粗毒素液处理的小麦叶片ＰＡＬ活性表明，小麦叶片用４０％的粗毒素液处理，叶内ＰＡＬ活性值最高；低浓度的毒素液刺激ＰＡＬ活性产生，而高浓度的粗毒素液抑制叶内ＰＡＬ活性。
Changes in phenylalanine ammonia lyase (PAL) activity in wheat leaves were determined by inoculation of the crude toxin and conidia of the leaf molds of K.cerevisiae with different leaf blight resistant wheat varieties. The effects of the toxins Pathogenesis in the process of disease. The results showed that both crude toxin solution and sporozoite had the effect of increasing PAL activity. However, the stimulus intensity of the two strains was different, the toxin treatment was more than the conidia inoculation, and the resistant varieties were more than the susceptible ones. The determination of PAL activity of wheat leaves treated with different concentrations of crude toxin solution showed that PAL activity was the highest in leaves of wheat with 40% crude toxin solution; low concentrations of toxin solution stimulated PAL activity while high concentrations of crude toxin inhibited PAL activity in leaves.