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1Division of Entomology, Commonwealth Scientific and Industrial Research Organisation, Canberra ACT 2601, Australia
2Laboratoire de Pathologie Comparée, Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique Unité de Recherche Associée 2209, Université Montpellier II, 34095 Montpellier Cedex 5, France
* Corresponding author. Mailing address: Division of Entomology, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra ACT 2601, Australia.
ABSTRACT
Bacterial strains isolated from wide ranges of nematode hosts and geographic sources and strains isolated from human clinical specimens were used to assess the taxonomic structure of the genus Photorhabdus. The following two methods were used: DNA relatedness and phenotypic characterization. Analysis of the DNA relatedness data revealed that all of the strains studied were congeneric and that the genus Photorhabdus is, on the basis of DNA relatedness data, more homogeneous than the other genus of nematode-symbiotic bacteria, the genus Xenorhabdus. In contrast to previous reports, only two DNA relatedness groups were identified in the genus Photorhabdus. These groups corresponded to the symbiotic strains and the clinical strains. There appeared to be some subgroups within the symbiotic strain group on the basis of the interactions of the strains with nematodes, which corresponded to some extent with the DNA relatedness data. However, there were significant ambiguities in the DNA relatedness data, and this group could not be subdivided on the basis of DNA relatedness data or phenotypic data. The distinct functional differences within and between the DNA relatedness groups of symbiotic Photorhabdus strains indicated that there are biologically significant subgroups within the genus Photorhabdus that cannot be defined at this time. Further investigation of the taxonomy of Photorhabdus by using different approaches and a suitably wide range of strains is recommended. However, it is clear that the clinical strains form a recognizable subgroup within the genus even though no formal subtaxon can be defined at this time.
Dedicated to Lucienne Baud (deceased 9 August 1994) in memory of her contribution. This article has been cited by other articles:
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