Yang Sun1, Lu Xu2, Qiong Chen1, Wenjing Qin1, Shuijin Huang1, Ying Jiang1, Houguo Qin1. 1. Institute of Plant Protection, Jiangxi Academy of Agricultural Science, Nanchang, China. 2. Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Abstract
BACKGROUND: The rice striped stem borer (SSB), Chilo suppressalis (Walker), is one of the most economically important and destructive rice pests in China. To date, the efficiency of conventional insecticides has decreased greatly because of the development of high resistance. Since the introduction of chlorantraniliprole in 2008, SSB has presented resistance issues. RESULTS: In this study, laboratory resistant strains R1 and R2 [resistance ratio (RR) of 38.8 and 110.4, respectively] were established and a field population HR (RR of 249.6) was collected. Synergist assessment and enzyme activity data suggested the potential involvement of P450s and esterases in the resistance mechanism. No target (ryanodine receptor, RyR) mutation was found in R1, but a novel mutation Y4667D was found in R2. At the same position of RyR in HR strain, Y4667D and Y4667C were observed at low frequencies. In addition, the conserved mutation I4758M was found with a frequency of 94.4%. RyR mRNA expression was significantly lower in R1, R2 and HR than in S. When treated with chlorantraniliprole, RyR mRNA expression in all four strains was downregulated to ∼ 50%. CONCLUSIONS: A comprehensive analysis, including biochemical, target mutations and target mRNA expression, was conducted in an attempt to interpret the chlorantraniliprole resistance mechanism in both laboratory and field SSB strains.
BACKGROUND: The rice striped stem borer (SSB), Chilo suppressalis (Walker), is one of the most economically important and destructive rice pests in China. To date, the efficiency of conventional insecticides has decreased greatly because of the development of high resistance. Since the introduction of chlorantraniliprole in 2008, SSB has presented resistance issues. RESULTS: In this study, laboratory resistant strains R1 and R2 [resistance ratio (RR) of 38.8 and 110.4, respectively] were established and a field population HR (RR of 249.6) was collected. Synergist assessment and enzyme activity data suggested the potential involvement of P450s and esterases in the resistance mechanism. No target (ryanodine receptor, RyR) mutation was found in R1, but a novel mutation Y4667D was found in R2. At the same position of RyR in HR strain, Y4667D and Y4667C were observed at low frequencies. In addition, the conserved mutation I4758M was found with a frequency of 94.4%. RyR mRNA expression was significantly lower in R1, R2 and HR than in S. When treated with chlorantraniliprole, RyR mRNA expression in all four strains was downregulated to ∼ 50%. CONCLUSIONS: A comprehensive analysis, including biochemical, target mutations and target mRNA expression, was conducted in an attempt to interpret the chlorantraniliprole resistance mechanism in both laboratory and field SSB strains.
Authors: Ewan Richardson; Bartek J Troczka; Oliver Gutbrod; Ulrich Ebbinghaus-Kintscher; Martin S Williamson; Christopher H George; Ralf Nauen; Thomas G Emyr Davies Journal: Int J Mol Sci Date: 2021-12-02 Impact factor: 5.923
Authors: Ewan Richardson; Rafael A Homem; Bartlomiej J Troczka; Christopher H George; Ulrich Ebbinghaus-Kintscher; Martin S Williamson; Ralf Nauen; Tg Emyr Davies Journal: Pest Manag Sci Date: 2021-12-03 Impact factor: 4.462