551. Krüppel-homologue 1 regulates the development of Tuta absoluta and its cascade regulation pattern in the juvenile hormone signalling pathway.
- Author
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Wang X, Bi S, Tang Y, Zhang G, Huang C, Wan F, Lü Z, and Liu W
- Subjects
- Animals, Kruppel-Like Transcription Factors genetics, Kruppel-Like Transcription Factors metabolism, Methoprene, Larva metabolism, Insect Proteins genetics, Insect Proteins metabolism, Juvenile Hormones metabolism, Lepidoptera
- Abstract
Tomato leaf miner, Tuta absoluta (Meyrick), is one of the most destructive quarantine pests globally. It has been confirmed that Krüppel-homologue 1 ( kr-h1 ) plays a key role in the regulation of juvenile hormone (JH). However, it is unclear how kr-h1 regulates the synthesis of JH and its cascade regulation pattern in tomato leaf miner. Here, we obtained the six JH signalling genes ( kr-h1 , Methoprene-tolerant , Forkhead box O , Juvenile acid methyltransferase , Juvenile hormone esterase and Fatty acid synthase 2 ), and applied RNA interference to explore the role of kr-h1 and the seven genes (plus Vitellogenin ) regulation relationship in T. absoluta . Bioinformatics analysis revealed the structural characteristics of kr-h1 protein and JH receptor Met, which contained eight C2H2 zinc finger structures and three typical domains of the bHLH-PAS family, respectively. The expression levels of Met and Vg were upregulated after RNAi of kr-h1 gene, while the gene levels of JHAMT and FAS2 were downregulated. Furthermore, topical application of JH analogue to second instar larvae could induce the expression of kr-h1 and inhibit the expression of Met . Our study reveals the mechanism by which kr-h1 regulates JH pathway genes, which could be applied to control the growth of tomato leaf miners.
- Published
- 2023
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