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Inability of the Polyphasic Approach to Systematics To Determine the Relatedness of the Genera Xenorhabdus and Photorhabdus

¹ DSM-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, 38124 Braunschweig, Germany
² Abteilung Biotechnologie und Biologischer Pflanzenschutz, Institut für Phytopathologie, Christian-Albrechts-Universität, 24223 Klausdorf, Germany

^* Corresponding author. Mailing address: DSM-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, 38124 Braunschweig, Germany. Phone: 49 531 2616 352. Fax: 531 2616 418. Electronic mail address: stackebrandt{at}venus.gbfbraunschweig.d400.de.

ABSTRACT

Comparative analysis of the genes coding for 16S rRNA of the type strains of Xenorhabdus and Photorhabdus species indicates the close phylogenetic relationship of these two genera. However, distance matrix analyses do not unambiguously separate the symbionts of entomopathogenic nematodes according to their assignment into different genera. When various 16S rRNA gene sequences from a selection of members of the gamma subclass of Proteobacteria and outgroup taxa were used, the intrageneric relationships of Xenorhabdus species and the positions of Photorhabdus luminescens and related species changed significantly.

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