印度谷螟18S rDNA的克隆及定量PCR方法的建立

Cloning of the 18S rDNA and Establishment of Quantitative Real-Time PCR Plodia interpunctella

利用分子生物学方法从印度谷螟幼虫体内克隆获得了18S rDNA的基因全长序列(1 888 bp,GenBank登录号为KJ836335)。利用邻位连接法(neighbor-joining)分别构建了基于18S rDNA基因全长、保守序列Ⅱ以及多变区的系统发育树,比较了与其他已知昆虫18S rDNA基因的同源性和遗传距离。与其他序列的系统发育树相比,其全长序列的系统发育树更能反映鳞翅目昆虫的亲缘关系,印度谷螟与大蜡螟的亲缘关系最近。此外,建立了以18S rDNA为内参基因的实时荧光定量PCR方法。

The full-length sequence of 18S rDNA gene （1 888 bp, GenBank accession number： KJ836335） was obtained by cloning from the Plodia interpunctella larva using molecular biology method in this paper. The neigh- bor joining method was used to construct phylogenetic trees based on full - length sequence, conservative sequence II and the variable area of 18S rDNA gene respectively, comparing the homology and genetic distance with 18S rDNA gene of other known insects. The phylogenetic tree based on the full - length sequence can better reflect the genetic relationship of Lepidoptera insects compared with that based on the other sequences, Plodia interpunctella has the clo- sest genetic relationship with the C, alleria mellonella. In addition, the quantitative real -time PCR method was estab- lished with 18S rDNA as a reference gene.