棉铃疫病菌(Phytophthora boeh meriae)对甲霜灵的抗性遗传研究

 本文在实验室条件下,经药物直接诱变,筛选获得棉铃疫病菌(Phytophthora boehmeriae Sawada)抗甲霜灵突变株,研究了其抗药性性状的遗传。结果表明,棉铃疫病菌易对甲霜灵产生抗性,抗性菌株对甲霜灵的抗性水平可高达其敏感亲本的5161.3倍以上;部分抗性菌株的抗药性性状在无性及有性单孢后代均可稳定遗传,另有部分抗性菌株的抗性性状在无性单孢后代出现分离甚至完全丧失。初步认为,供试棉铃疫病菌对甲霜灵的抗性遗传可能与细胞质遗传因子有关

Studies on metalaxyl-resistance inheritance of Phytophthora boehmeriae causing cotton boll blight

The resistance inheritance of the metalaxyl-resistant mutants(Mt~r) of P. boehmeriae Sawada obtained by metalaxyl-induction was studied in vitro. The results showed that the tested pathogen deve-(loped) the resistance to metalaxyl easily, and that the resistance level of Mt~r mutants was over 5 161 3 times higher than that of their sensitive parental isolates to metalaxyl. The resistance of some mutants to metalaxyl could steadily inherit in their asexual and sexual generations, but the resistance of some mutants to metalaxyl displayed obvious variation in the first and second single-zoospore progenies, even lost completely. It was suggested that metalaxyl-resistance of P. boehmeriae causing cotton boll blight might be controlled by cytoplasmic genes.