白菜黑斑病菌（Alternaria　brassicae）毒素钝化物的初步研究

Preliminary Study on Inactivators of Pathotoxin Produced by Alternaria brassicae

通过３０种化合物对白菜黑斑病菌Ａｌｔｅｒｎａｒｉａｂｒａｓｓｉｃａｅ毒素钝化作用的研究。结果表明：Ｎａ＋、碱性物质和ＫＭｎＯ４。对毒素具有很强的钝化作用，而且随着浓度的提高，钝化作用增强，钝化物在离休叶片上的防效为６３～１００％；２０００ｍｇ／Ｌ的化合物对白菜黑斑病分生孢子萌发有较强的抑制作用，但对菌丝生长没有影响。

compounds whether they could inactivated AB-toxin (a pathotoxin produced by Altenaria brassicae) have been studied. The results showed that Na+, alkali-substance and KMnO4 markely inactivation of these compounds to AB-toxin altered with their concentrations. The higher their concentrations, the stronger inactivation to AB-toxin. The control effects of these compounds against leaf black spot of chinese cabbage were 63%～100%; Conidia germination of Alternaria brassicae was inhibited by concentrations as high as 2 000mg/L but hyphae growth was not affected by them.