数字农科院2.0

Cuticle thickening mediates insecticide penetration resistance in Spodoptera litura

文献类型： 外文期刊

作者： 王冰洁;;李明辉;;王梦雨;;王恒杰;;唐姿;;赵辉;;魏鹏;;廖晓蓝;;薛文鑫;;逄兰;;石力

关键词： Spodoptera litura; penetration resistance; cuticular protein FTZ-F1; chitin synthesis pathway 20E

期刊名称： Journal of Advanced Research

ISSN： 2090-1232

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Introduction: Long-term and extensive use of chemical pesticides has led to the development of resistance in many important agricultural pests. The mechanisms of resistance formation in pests are complex and variable, and unraveling the resistance mechanisms is the key to control reesistant pests. Insect cuticle, as the first line of defense for insecticides, plays a non-negligible role in insecticide penetration resistance. Although penetration resistance is widespread in insects, the multiple molecular mechanisms that impede insecticide penetration are unclear, especially in Spodoptera litura.Objectives: This study aims to reveal the molecular mechanisms of insecticide penetration resistance in S.litura. Methods: The structure and thickness of cuticle were analyzed by TEM, and the role of cuticle in penetration resistance was determined by different application methods. The molecular mechanism of cuticular proteins overexpression was analyzed using RNAi, TEM, dual-luciferase assay and EMSA from cis- and trans-acting factors. In addition, the relationship between the chitin synthetic pathway and insecticide resistance was explored through enzyme activity, inhibitor assay, molecular docking and RNAi. Furthermore, the role of 20E in penetration resistance was analyzed. resistant populations was significantly thickened and accompanied by extrugnificantly to indoxacarb resistance. Constitutive upregulation of trans-acting ates the overexpression of SlituCP26 with cis-acting elements in the SlituCP26), affecting the cuticle thickness mediated indoxacarb penetration resistance.

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