Fast and accurate identification of Xenorhabdus and Photorhabdus species by restriction analysis of PCR-amplified 16S rRNA genes

Author:

Brunel B1,Givaudan A1,Lanois A1,Akhurst R J1,Boemare N1

Affiliation:

1. Laboratoire de Recherche sur les Symbiotes des Racines, Ecole Nationale Supérieure Agronomique de Montpellier, Institut National de la Recherche Agronomique, France.

Abstract

Thirteen bacterial strains of Xenorhabdus and 14 strains of Photorhabdus originating from a wide range of geographical and nematode host sources were typed by analyzing 16S rRNA gene (rDNA) restriction patterns obtained after digestion of PCR-amplified 16S rDNAs. Eight tetrameric restriction endonucleases were examined. A total of 17 genotypes were identified, forming two heterogeneous main clusters after analysis by the unweighted pair-group method using arithmetic averages: group I included all Xenorhabdus species and strains, symbionts of Steinernema, whereas group II encompassed the Photorhabdus strains, symbionts of Heterorhabditis. To identify the four valid species of Xenorhabdus and unclassified strains and all the genotypes of Photorhabdus luminescens, three restriction enzymes are required: CfoI, AluI, and HaeIII. Our results, in substantial agreement with DNA-DNA pairing and 16S rDNA sequence data, indicate that amplified 16S rDNA restriction analysis is a simple and accurate tool for identifying entomopathogenic nematode bacterial symbionts.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference38 articles.

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3. Xenorhabdus nematophilus subsp. poinarii. Its interaction with insect pathogenic nematodes;Akhurst R. J.;Syst. Appl. Microbiol.,1986

4. Akhurst R. J. and N. E. Boemare. 1990. Biology and taxonomy of Xenorhabdus p. 75-90. In R. Gaugler and H. K. Kaya (ed.) Entomopathogenic nematodes in biological control. CRC Press Boca Raton Fla.

5. A numerical taxonomic study of the genus Xenorhabdus (Enterobacteriaceae) and proposed elevation of the subspecies of X. nematophilus to species;Akhurst R. J.;J. Gen. Microbiol.,1988

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