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首页> 外文期刊>Plant Pathology >Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China
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Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

机译：有性生殖增加了辣椒疫霉菌对中国甲虫病产生抗药性的可能性

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摘要

A total of 1511 isolates of Phytophthora capsici were collected from farms with no history of exposure to the carboxylic acid amide (CAA) fungicides in 32 provinces in China during 2006 to 2013. All 1511 isolates were assayed for mating type and 403 were assayed for sensitivity to dimethomorph (DMM) and metalaxyl. The DMM EC50 values ranged from 0126 to 0339gmL(-1). Both A1 and A2 mating types were detected on the same farms in four provinces and with a 1:1 ratio. Most isolates were sensitive to metalaxyl but a few exhibited intermediate resistance or resistance to metalaxyl. The segregation of DMM resistance and sensitivity among 337 progeny obtained from hybridization or self-crossing in vitro indicated that the resistance of P.capsici to DMM is controlled by two dominant genes. Eighteen progeny that were derived from hybridization differed in DMM sensitivity and in fitness. Some progeny were as fit as parental isolates. Given the distribution of mating types and therefore the potential for sexual reproduction, the control of resistance by two dominant genes, and the fitness of hybrid progeny, the risk of P.capsici populations developing DMM resistance in China is substantial.
机译：2006年至2013年间，在中国32个省份共收集了1511株辣椒疫霉菌菌株，这些菌株没有接触过羧酸酰胺（CAA）杀真菌剂。对所有1511株菌株进行了交配型检测，对403株敏感性进行了检测。制成二甲基吗啡（DMM）和甲霜灵。 DMM EC50值的范围为0126至0339gmL（-1）。在四个省的同一农场中以1：1的比例检测到A1和A2交配类型。大多数分离株对甲霜灵敏感，但少数表现出中等抗性或对甲霜灵的抗性。从体外杂交或自交获得的337个子代中，DMM抗性和敏感性的分离表明辣椒辣椒对DMM的抗性由两个显性基因控制。源自杂交的18个后代在DMM敏感性和适应性方面有所不同。一些后代与父母分离株一样适合。考虑到交配类型的分布以及有性繁殖的潜力，两个优势基因对耐药性的控制以及杂种后代的适应性，中国辣椒辣椒种群发展DMM耐药性的风险很大。

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