title: Evolutionary relationships of three new species of Enterobacteriaceae living as symbionts of aphids and other insects.
abstract: Ecological studies on three bacterial lineages symbiotic in aphids have shown that they impose a variety of effects on their hosts, including resistance to parasitoids and tolerance to heat stress. Phylogenetic analyses of partial sequences of gyrB and recA are consistent with previous analyses limited to 16S rRNA gene sequences and yield improved confidence of the evolutionary relationships of these symbionts. All three symbionts are in the Enterobacteriaceae. One of the symbionts, here given the provisional designation "Candidatus Serratia symbiotica," is a Serratia species that has acquired a symbiotic lifestyle. The other two symbionts, here designated "Candidatus Hamiltonella defensa" and "Candidatus Regiella insecticola," are sister groups to one another and together show a relationship to species of Photorhabdus.
authors.affiliation: Department of Ecology and Evolutionary Biology, Biological Sciences West 310, University of Arizona, Tucson, Arizona 85721, USA. nmoran@u.arizona.edu
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Moran
authors.forename: Jacob A
authors.initials: JA
authors.lastname: Russell
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Koga
authors.forename: Takema
authors.initials: T
authors.lastname: Fukatsu
mesh_terms: D000818:Animals; D001042:Aphids / Q000382:microbiology*; D027081:DNA Gyrase / Q000235:genetics; D004755:Enterobacteriaceae / Q000145:classification* / Q000235:genetics / Q000254:growth & development / Q000648:ultrastructure; D019143:Evolution, Molecular; D007313:Insecta / Q000382:microbiology*; D046529:Microscopy, Electron, Transmission; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012338:RNA, Ribosomal, 23S / Q000235:genetics; D011938:Rec A Recombinases / Q000235:genetics; D017422:Sequence Analysis, DNA; D013559:Symbiosis
chemical_list: D012336:RNA, Ribosomal, 16S; D012338:RNA, Ribosomal, 23S; D011938:Rec A Recombinases; D027081:DNA Gyrase