Insect hormones affect the toxicity of the insecticidal growth regulator cyromazine in Liriomyza trifolii (Diptera: Agromyzidae)

• Published in: Pesticide biochemistry and physiology Vol. 188; p. 105263
• Main Authors: Chang, Ya-Wen, Wang, Yu-Cheng, Yan, Yu-Qing, Wu, Cheng-Dong, Xie, Hong-Fang, Gong, Wei-Rong, Du, Yu-Zhou
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2022
• Subjects: Cyromazine; Insect hormones; Liriomyza trifolii; Toxicity; Transcriptome; Toxicity; Cyromazine; Transcriptome; Insect hormones; Liriomyza trifolii
• ISSN: 0048-3575; 1095-9939
• DOI: 10.1016/j.pestbp.2022.105263

The leafminer Liriomyza trifolii is an important insect pest of ornamental and vegetable crops worldwide. Cyromazine is an effective, commonly-used insecticide that functions as a growth regulator, but its effect on L. trifolii has not been previously reported. In this study, transcriptome analysis was undertaken in L. trifolii exposed to cyromazine. Clusters of orthologous groups analysis indicated that a large number of differentially expressed genes responding to cyromazine were categorized as “lipid transport and metabolism”, “post-translational modification, protein turnover, chaperones”, and “cell wall/membrane/envelope biogenesis”. Gene ontology analysis indicated that pathways associated with insect hormones, growth and development, and cuticle synthesis were significantly enriched. In general, the transcriptome results showed that the genes related to insect hormones were significantly expressed after treatment with cyromazine. Furthermore, the combined exposure of L. trifolii to cyromazine and the hormone analogues 20-hydroxyecdysone (20E) or juvenile hormone (JH) indicated that hormone analogues can change the expression pattern of hormone-related genes (20EP and JHEH) and pupal length. The combined application of cyromazine with 20E improved the survival rate of L. trifolii, whereas the combination of JH and cyromazine reduced survival. The results of this study help elucidate the mechanistic basis for cyromazine toxicity and provide a foundation for understanding cyromazine resistance. [Display omitted] •Transcriptome analysis was undertaken in L. trifolii exposed to cyromazine.•Genes related to hormones were significantly expressed after cyromazine exposure.•Hormone analogues changed the expression of hormone-related genes and pupal length.•20E can improve survival, whereas JH reduced survival after cyromazine application.