A multilocus approach to assessing co-evolutionary relationships between <Emphasis Type="Italic">Steinernema</Emphasis> spp. (Nematoda: Steinernematidae) and their bacterial symbionts <Emphasis Type="Italic">Xenorhabdus</Emphasis> spp. (γ-Proteobacteria: Enterobacteriaceae) |
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Authors: | Ming-Min Lee S Patricia Stock |
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Institution: | (1) Department of Entomology, University of Arizona, 1140 E. South Campus Dr., Tucson, AZ 85721-0036, USA; |
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Abstract: | Nematodes of the genus Steinernema Travassos, 1927 (Nematoda: Steinernematidae) and their associated bacteria, Xenorhabdus spp. (γ-Proteobacteria), are an emergent model of terrestrial animal-microbe symbiosis. Interest in this association initially
arose out of their potential as biocontrol agents against insect pests, but, despite advances in their field application and
the growing popularity of this model system, relatively little has been published to uncover the evolutionary facets of this
beneficial partnership. This study adds to the body of knowledge regarding nematode-bacteria symbiosis by proposing a possible
scenario for their historical association in the form of a cophylogenetic hypothesis. Topological and likelihood based testing
methods were employed to reconstruct a history of association between 30 host-symbiont pairs and to gauge the level of similarity
between their inferred phylogenetic patterns. |
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