以离体筛选获得的小麦抗根腐病突变体及其亲本为材料,在根腐病菌毒素作用下,研究了过氧化物酶、超氧化物歧化酶和苯丙氨酸解氨酶等防御酶系的变化。结果表明,毒素可使上述酶活性、同工酶谱带发生改变。突变体酶的变化比亲本显著,这些变化与它们的抗病性强弱相一致。可以认为,突变体在毒素作用下具有较强的防御酶活性是产生较强抗性的原因。 In vitro screening of wheat root rot resistance mutants and their parents as materials, root rot pathogens toxins, the study of peroxidase, superoxide dismutase and phenylalanine ammonia lyase and other defense enzymes Department of change. The results show that the toxin can make the above enzyme activity, isozyme bands changed. Mutant enzyme changes more significantly than the parent, these changes are consistent with their resistance to disease. It can be considered that mutants have stronger defensive enzyme activity under the action of toxins, which is the cause of stronger resistance.