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本文以白菜幼苗为材料，研究了芸苔链格孢菌毒素（ＡＢ－ 毒素） 对白菜叶片细胞膜透性及叶片内ＳＯＤ 酶、ＰＯＤ 酶活性变化的影响。结果表明，白菜叶片用ＡＢ－ 毒素处理后，细胞膜透性增大，且随处理时间的延长和毒素浓度的增加而增高。不同白菜品种用毒素处理后膜透性的改变与病菌接种的发病程度呈正相关，即电导率大的白菜品种，叶片发病也重。试验结果还发现，芸苔链格孢菌及其毒素处理白菜后，体内ＳＯＤ 酶和ＰＯＤ 酶活性的变化基本趋于一致，即处理后１２ ｈ 内急剧下降，然后（１２ ～４８ ｈ） 活性上升。而对照处理基本变化不大。可见，芸苔链格孢菌毒素表现了与其病原菌一致的致病作用
In this paper, cabbage seedlings were used to study the effects of Alternaria brassicae to membrane permeability and the activities of SOD and POD in leaf of cabbage. The results showed that the membrane permeability of cabbage leaves increased with AB-toxin treatment and increased with the prolongation of treatment time and the increase of toxin concentration. The change of membrane permeability of different cabbage varieties treated with toxin was positively correlated with the incidence of pathogen inoculation, that is, the cabbage varieties with large electric conductivity and the incidence of leaves were also heavier. The results also showed that the changes of SOD and POD activities of Brassica campestris and its toxin in cabbage were almost the same, that is, the sharp decline in 12 h after treatment and the increase in activity (12 ~ 48 h) . The basic control changes little. Can be seen, Brassica Alternaria toxin showed consistent pathogenic role of pathogenic bacteria