The sweetpotato whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae), is a pest of many economically important agricultural crops and a vector of plant viruses. Bemisia tabaci harbors facultative endosymbiont species that have been implicated in pest status, including tolerance to insecticides, virus transmission efficiency and tolerance to high-temperatures. The facultative endosymbionts reported in B. tabaci include Arsenophonus, Hamiltonella, Wolbachia, Cardinium, Fritschea and Rickettsia. We collected whitefly populations from weed and crop hosts in south Florida and identified the whitefly species as well as the facultative endosymbionts present in these populations by molecular analysis. In addition, a phylogenetic analysis of whiteflies and their endosymbionts was performed. The only facultative endosymbionts found among the B. tabaci populations collected in Florida were Hamiltonella and Rickettsia. The phylogenetic analysis revealed the low genetic diversity of whiteflies and their endosymbionts. Additionally, the phylogenetic tree clustered Rickettsia from Florida in the R1 genetic group. The results will aid to understand the role of the bacterial endosymbionts in the whitefly host.

中文翻译：

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佛罗里达烟粉虱（半翅目：无翅目）种群之间的细菌内共生体多样性

甘薯粉虱，烟粉虱（Bemisia tabaci）（半翅目：无翅目）是许多具有重要经济意义的农作物的害虫，也是植物病毒的载体。烟粉虱（Bemisia tabaci）具有兼性的共生菌种，这些种与害虫状况有关，包括对杀虫剂的耐受性，病毒传播效率和对高温的耐受性。在烟粉虱中报道的兼性共生菌包括Arsenophonus，Hamiltonella，Wolbachia，Cardinium，Fritschea和Rickettsia。我们从佛罗里达州南部的杂草和农作物寄主中收集了粉虱种群，并通过分子分析鉴定了这些种群中的粉虱种类以及兼性共生菌。此外，对粉虱及其内共生体进行了系统发育分析。在佛罗里达州收集的烟粉虱中，仅有的兼性共生菌是汉密尔顿菌和立克次体。系统发育分析表明，粉虱及其内共生体的遗传多样性较低。此外，系统发育树将来自佛罗里达的立克次体聚集在R1基因组中。结果将有助于了解细菌内共生体在粉虱宿主中的作用。