Phylogenetic Relationships and Evolution of Endosymbionts in Bemisia tabaci Based on Partial 16S rDNA Sequences
烟粉虱内共生菌16S rDNA的变异与系统发生

Endosymbionts evolute with insects and benefit from each other. Endosymbiont affects the growth, fertilizing and transmitting disease of insect. In order to understand the control methods and evolution mechanism of Bemisia tabaci , cloning and sequencing of 16S rDNA of endosymbionts in Bemisia tabaci long term living on different host plants in Peking were conducted. Molecular phylogenetic trees, including about 1000bp 16S rDNA of primary endosymbionts in Bemisia tabaci and about 1250bp16S rDNA of secondary endosymbionts in Bemisia tabaci ,were reconstructed. The results showed that primary endosymbionts in Bemisia tabaci were Proteobacteria,Gammaproteobacteria,Oceanospirillales,Halomonadaceae,Zymobacter group, Candidatus Portiera aleyrodidarum, and secondary endosymbionts in Bemisia tabaci were Proteobacteria,Gammaproteobacteria,Enterobacteriales, Enterobacteriaceae. The endosymbionts from Bemisia tabaci of different host plants and other countries might belong to different ecological types of one species. The conclusion could be drawn that there are independent acquisition of various endosymbionts in Bemisia tabaci from different host plants, and endosymbionts play important roles on Bemisia tabaci accommodation with different environment.