通过紫外诱导在 PDA平板上获得抗多菌灵或菌核净的油菜菌核病菌抗药性突变体 ,突变频率 2 .4× 1 0 - 4～ 2 .4× 1 0 - 5。突变体与敏感亲本菌株相比菌丝生长存在个体差异 ,仅 85.7%的抗菌核净突变体表现致病 ,而所有敏感菌株及抗多菌灵突变体均能致病。抗菌核净突变体比敏感亲本菌株产菌核能力弱 ,并对渗透压表现敏感。研究表明抗菌核净突变体的生存竞争能力低于野生敏感菌和抗多菌灵突变体 The resistant mutants of sclerotinia sclerotiorum obtained by antimicrobial resistance or sclerotia on PDA plates were induced by ultraviolet light. The mutation frequency was 2.4 × 10-4 ~ 2.4 × 10-5. There were individual differences in mycelial growth between the mutant and the sensitive parental strain. Only 85.7% of the antibacterial nuclear mutants showed pathogenicity, while all the sensitive strains and the anti-carbendazim mutants were pathogenic. The antibacterial nuclear net mutant had weaker ability of producing bacteria than the sensitive parental strain and was sensitive to the osmotic pressure. Studies have shown that the antibacterial nuclear net mutant of survival than competing ability of wild-sensitive and anti-carbendazim mutants