Comparative Insecticidal Activity and Mechanism of Isocycloseram versus Other GABAergic Insecticides against the Fall Armyworm
文献类型： 外文期刊
作者： Liu, Xinyu 1 ; Liu, Feifan 1 ; Tang, Tao 2 ; Wang, Junyan 1 ; Wang, Ying 1 ; Huang, Qiutang 1 ; Wang, Qiuxia 1 ; Zhao, Chunqing 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Minist Agr, Key Lab Integrated Pest Management Crops East Chin, Nanjing 210095, Peoples R China
2.Hunan Acad Agr Sci, Inst Plant Protect, Changsha 410125, Peoples R China
关键词： isoxazolines; chloride channel; RDL subunit; cys-loop receptor
期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.7； 五年影响因子：6.0 ）
ISSN： 0021-8561
年卷期： 2024 年 72 卷 34 期
页码：
收录情况： SCI
摘要： The fall armyworm (FAW) is a serious agricultural pest and has developed resistance to multiple insecticides. It is necessary to introduce novel insecticide(s) for controlling FAW. Isocycloseram is a completely novel isoxazoline insecticide. However, its activity and mode of action against FAW have not been reported. In this study, isocycloseram exhibited a higher insecticidal activity (LC50 = 0.26 mg/kg) than fipronil (LC50 = 7.72 mg/kg) against FAW. The median inhibitory concentration (IC50) of isocycloseram (IC50 = 8.52 nM) was almost equal to that of the desmethyl-broflanilide (IC50 = 7.32 nM) to the SfrRDL1 receptor. The IC50 of isocycloseram to the SfrRDL2 receptor was 11.13 nM, which was obviously less than that of desmethyl-broflanilide, dieldrin, fipronil, fluxametamide. Compared with the SfrRDL2 receptor, the SfrRDL1 receptor exhibited higher sensitivity to GABAergic insecticides. The recombinant SfrGluCl receptor was successfully stimulated by l-glutamate; however, the currents were low and weakly inhibited by isocycloseram at 10 mu M. In conclusion, our results provided the theoretical basis for usage of GABAergic insecticides for controlling FAW.
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