摘要
Panonychus citriMcGregor(Acari:Tetranychidae),a destructive citrus pest,causes considerable annual economic losses due to its short lifespan and rapid resistancedevelopment.MicroRNA(miRNA)-induced RNA interference is a promising approachfor pest control because of endogenous regulation of pest growth and development.Tosearch for miRNAs with potential insecticidal activity inP.citri,genome-wide analysis ofmiRNAs at different developmental stages was conducted,resulting in the identificationof 136 miRNAs,including 73 known and 63 novel miRNAs.A total of 17 isomiRNAsand 12 duplicated miRNAs were characterized.MiR-1 and miR-252-5p were identified asreference miRNAs forP.citriandTetranychus urticae.Based on differential expressionanalysis,treatments with miR-let-7a and miR-315 mimics and the miR-let-7a antagomirsignificantly reduced the egg hatch rate and resulted in abnormal egg development.Over-expression or downregulation of miR-34-5p and miR-305-5p through feeding significantlydecreased the adult eclosion rate and caused molting defects.The 4 miRNAs,miR-let-7a,miR-315,miR-34-5p,and miR-305-5p,had important regulatory functions and insectici-dal properties in egg hatching and adult eclosion.In general,these data advance our un-derstanding of miRNAs in mite biology,which can assist future studies on insect-specificmiRNA-based green pest control technology.
基金
supported by the National Natural Sci-ence Foundation of China(31972272,31871969)
the Fundamental Research Funds for the Central Universi-ties(SWU-XDPY22001)of China
the China Agri-cultural Research System of MOA and MARA。
