用PCR-RFLP方法鉴别赤拟谷盗和杂拟谷盗的研究

    Identification of Tribolium castaneum and Tribolium confusum based on PCR-RFLP

    • 摘要: 为快速准确鉴定外部形态相似的赤拟谷盗(Tribolium castaneum(Herbst))和杂拟谷盗(Tribolium confusum Jacquelin du Val),分别对赤拟谷盗和杂拟谷盗的成虫和幼虫Cytb基因片段进行PCR扩增、测序,并分析两物种该基因片段的限制性内切酶位点差异,根据PCR产物酶切图谱的差异进行物种鉴定。结果表明:两种害虫成虫和幼虫所选Cytb基因扩增片段长度均为640 bp,两物种该基因片段序列同源性为77.19%,核苷酸转换发生83次,颠换发生63次,转换与颠换次数比为1.3;两物种该片段内BstX I、Sal I、Xba I、Vsp I和Age I等5种限制性内切酶酶切具有显著差异,对BstX I、Sal I、Xba I和Vsp I 4种酶切图谱进行了验证,其酶切图谱与软件分析结果一致,可以通过这4种限制酶的酶切图谱对赤拟谷盗和杂拟谷盗的成虫及幼虫进行快速准确鉴定。用PCR-RFLP方法可以准确鉴定赤拟谷盗和杂拟谷盗的幼虫和成虫,为精准防控提供科学支持。

       

      Abstract: Utilizing the sequence differences of the cytochrome b (Cytb) gene in mitochondrial DNA allows for the rapid and accurate identification of the externally similar Tribolium castaneum (Herbst) and Tribolium confusum Jacquelin du Val, providing an essential foundation for improving precision control of stored grain pests. This study amplified, sequenced, and analyzed the Cytb gene fragments of adult and larval stages of T. castaneum and. T. confusum, respectively. The species were identified based on differences in restriction enzyme sites of these gene fragments. The amplified gene fragments of both pest species were 640 bp in length. The sequence homology of this gene fragment between the two species was 77.19%, with 83 nucleotide transitions and 63 transversions, resulting in a transition/transversion ratio of 1.3. Five restriction enzymes (BstX I, Sal I, Xba I, Vsp I, and Age I) showed differences in the gene fragment between the two species. The digestion profiles of BstX I, Sal I, Xba I, and Vsp I were validated, and their patterns matched the analysis results. These restriction enzyme digestion profiles enable rapid and accurate identification of T. castaneum and T. confusum at both adult and larval stages. The PCR-RFLP method can accurately identify the larvae and adults of T. castaneum and T. confusum, providing scientific support for precise pest control.

       

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