Differentiation of COⅠgene of the exotic red turpentine beetle Dendroctonus valens
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Key Words： Dendroctonus valens, COⅠgene, genetic differentiation, phylogenetic analysis
Abstract： The red turpentine beetle, Dendroctonus valens LeConte (Coleoptera: Scolytidae), is one of the most dangerous invasive insect species in China. The sequences of its mitochondrial cytochrome oxidase subunitⅠ(COⅠ) were determined (GenBank Accession No. GQ495096-GQ495128). Sequence analysis revealed 3 specific loci among 160 genetic codes that distinguish D. valens from other Dendroctonus species. Comparison of different geographic populations indicates that genetic differentiation in Chinese populations of D. valens is not obvious, suggesting that genetic variation in local populations of this invasive species will require a long period of time under different local conditions. By aligning the COⅠgene sequences, we found that the sequences of red turpentine beetles in China were homologous to those from parts of the United States and spread to China with the increase in the international trade in timber.