Zhejiang Branch of National Pesticide R&D South Center, Zhejiang Chemical Industry Research Institute, Hangzhou 310023, China.
Institute of Plant Protection and Agro-Products Safety, Anhui Academy of Agricultural Sciences, Hefei 230031, China.
Pestic Biochem Physiol. 2014 Jan;108:16-20. doi: 10.1016/j.pestbp.2013.11.001. Epub 2013 Nov 27.
Asia minor bluegrass (Polypogon fugax) is a common annual grass weed of winter crops distributed across China. We conducted a study on the resistance level and the mechanism of resistance to ACCase-inhibiting herbicides in a P. fugax population from China. Whole-plant dose-response experiments in greenhouse showed that the resistant P. fugax population was 1991, 364, 269, 157, and 8-fold resistant to clodinafop-propargyl, fluazifop-p-butyl, haloxyfop-R-methyl, quizalofop-p-ethyl and fenoxaprop-p-ethyl relative to the reference susceptible population, which was susceptible to all the five AOPP herbicides. Much lower R/S values of 3.5, 2.4 and 3.5, respectively, were detected for clethodim, sethoxydim and pinoxaden. Molecular analysis of resistance confirmed that the Ile2041 to Asn mutation in the resistant population conferred resistance to AOPP herbicides, but not to CHD and DEN herbicides. This is the first report of a target site mutation that corresponded to resistance to AOPP herbicides in P. fugax. Proper resistance management practices are necessary to prevent ACCase-inhibiting herbicides from becoming ineffective over wide areas.
小亚细亚早熟禾（Polypogon fugax）是中国冬季作物中常见的一年生杂草。我们对来自中国的 P. fugax 种群对 ACCase 抑制剂类除草剂的抗性水平和抗性机制进行了研究。温室全株剂量反应试验表明，与参考敏感种群相比，抗性 P. fugax 种群对氯氟吡氧乙酸丙炔酯、唑嘧磺草胺、精噁唑禾草灵、精喹禾灵和高效氟吡甲禾灵的抗性分别为 1991、364、269、157 和 8 倍，而该种群对所有 5 种 AOPP 除草剂均敏感。而Clethodim、Sethoxydim 和Pinoxaden 的 R/S 值分别为 3.5、2.4 和 3.5，均较低。抗性的分子分析证实，抗性种群中 Ile2041 到 Asn 的突变赋予了对 AOPP 除草剂的抗性，但对 CHD 和 DEN 除草剂没有抗性。这是首次报道 P. fugax 对 AOPP 除草剂的靶标位点突变导致的抗性。需要采取适当的抗性管理措施，以防止 ACCase 抑制剂类除草剂在广泛地区失效。
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