Identification and functional characterization of UDP-glycosyltransferase genes involved in cyetpyrafen resistance in Panonychus citri (McGregor).

BACKGROUND

Cyetpyrafen is a newly developed acaricide. The citrus red mite, Panonychus citri (McGregor), is an important citrus pest that has developed resistance to cyetpyrafen. Uridine diphosphate-glycosyltransferases (UGTs) have been widely reported to be associated with resistance to multiple acaricides. However, it has been rarely documented that UGT genes participate in cyetpyrafen resistance in P. citri.

RESULTS

In this study, a significantly upregulated UGT gene, PcUGT201E1, was identified in P. citri using transcriptome analysis. Expression of PcUGT201E1 was significantly upregulated at all stages in the cyetpyrafen-resistant strain and silencing PcUGT201E1 significantly increased the susceptibility of P. citri to cyetpyrafen. Molecular docking of PcUGT201E1 with uridine diphosphate glucose (UDPG) and cyetpyrafen indicated that UDPG and cyetpyrafen can interact with PcUGT202E1 via hydrogen bonds. Heterologous expression and in vitro functional assays revealed that enzyme activity could be inhibited by cyetpyrafen and that recombinant PcUGT201E1 can deplete cyetpyrafen.

CONCLUSION

These results indicated that PcUGT201E1 participates in cyetpyrafen resistance in P. citri by sequestration, and provided a molecular foundation for understanding cyetpyrafen resistance in P. citri. © 2025 Society of Chemical Industry.