数字农科院2.0

Host adaptation plasticity in Spodoptera exigua larvae: mechanistic insights from nutritional preferences and developmental shifts in carbohydrate metabolism

文献类型： 外文期刊

作者： Zhang, Bin;Li, Zaiyuan;Liu, Bo;Qiao, Fengjiao;Ma, Hancheng;Zheng, Guiling;Li, Jie;Yu, Qianlong;Qian, Wanqiang;Wan, Fanghao;Li, Changyou

作者机构：

关键词： （2-2-2）potential pest strategies. Beet armyworm;nutritional requirement;protein;immunity;metabolism pathway;lipid metabolism;stage-specific metabolism;CNMamide receptor

期刊名称： ENTOMOLOGIA GENERALIS

ISSN： 0171-8177

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Insects require different nutrients at different stages of development, understanding these requirements is essential for the effective management of agricultural pests. Hence, the goal of this study is to investigate the molecular mechanisms underlying the diverse nutritional requirements in Spodoptera exigua, an economically important pest of numerous crops and vegetables worldwide. In this study, we found that the preference of early-instar larvae for low-carbohydrate diets is primarily regulated by the CNMamide neuropeptide, whereas late-instar larvae prefer high-carbohydrate diets. Moreover, under high-carbohydrate conditions, both first-and third-instar larvae excreted excess glucose, whereas fifthinstar larvae likely converted glucose to fatty acid and energy. The transcriptome analysis revealed differentially expressed genes (DEGs) associated with the carbohydrate, lipid and energy synthesis and metabolism pathways. Furthermore, all these DEGs were down-regulated in first-and third-instar larvae, whereas over 91% of DEGs were up-regulated in fifthinstar larvae under high-carbohydrate diet. We also found that many genes related to immunity in S. exigua were properly up-regulated via lipid metabolism in early-instar larvae under a high-carbohydrate condition. Interestingly, genes involved in metabolizing exogenous substances were up-regulated as the larvae increased food intake, possibly resulting in enhanced detoxification metabolism in late-instar larvae fed a high-carbohydrate diet. These findings greatly enhance our understanding of the mechanisms underlying carbohydrate preference across larval stages of S. exigua and identify target genes for potential pest control strategies.

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