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RNAi of the nuclear receptor HR3 suggests a role in the molting process of the spider mite Panonychus citri

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Abstract

Ecdysteroids regulate molting in arthropods by binding to heterodimers of the ecdysone receptor and retinoid-X-receptor, homologous to the ultraspiracle protein, to induce the expression of downstream signal response genes including the nuclear receptor HR3. However, the detailed expression dynamics of HR3 during molting in spider mites are not yet clear. In this study, the full length of PcHR3 was retrieved based on the genome of citrus red mite, Panonychus citri. The open reading frame is 1707 bp encoding 568 amino acids, which contains a DNA binding domain and a ligand binding domain. Then, the expression pattern of PcHR3 was analyzed throughout the development of the deutonymph by RT-qPCR. The result showed that PcHR3 was mainly transcribed in the late deutonymph stage, when the deutonymph was at least 24 h old and motionless, the critical point at which the mites started molting. Transcription reached the highest level in 32-h-old deutonymphs and decreased by 36 h, where the mites remained in a quiescent state. Further silencing of PcHR3 by leaf-disc-based delivery of dsRNA to 8-h-old deutonymph mites, resulted in retarded development and death of 58% of deutonymphs. In summary, we suggest that PcHR3 regulates the latter stages of molting in P. citri.

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Acknowledgements

This study was supported in part by the National Natural Science Foundation (31871969), and the earmarked fund for Modern Agro-industry (Citrus) Technology Research System of China (CARS-26).

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Correspondence to Jin-Jun Wang.

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Li, G., Liu, XY., Han, X. et al. RNAi of the nuclear receptor HR3 suggests a role in the molting process of the spider mite Panonychus citri. Exp Appl Acarol 81, 75–83 (2020). https://doi.org/10.1007/s10493-020-00486-2

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