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Appl. Environ. Microbiol., Feb 1996, 473-479, Vol 62, No. 2
Copyright © 1996, American Society for Microbiology

Bacteriocin Typing of Burkholderia (Pseudomonas) solanacearum Race 1 of the French West Indies and Correlation with Genomic Variation of the Pathogen

P Frey, JJ Smith, L Albar, P Prior, GS Saddler, D Trigalet-Demery and A Trigalet
Laboratoire de Biologie Moleculaire des Relations Plantes-Microorganismes, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Castanet-Tolosan Cedex, France; International Mycological Institute, Egham, Surrey, United Kingdom; and Laboratoire de Recherches en Productions Vegetales, Institut National de la Recherche Agronomique, Pointe-a-Pitre Cedex, Guadeloupe, French West Indies

Burkholderia solanacearum race 1 isolates indigenous to the French West Indies were characterized by bacteriocin typing and two genomic fingerprinting methods: pulsed-field gel electrophoresis of genomic DNA digested by rare-cutting restriction endonucleases (RC-PFGE) and PCR with primers corresponding to repetitive extragenic palindromic (REP), enterobacterial repetitive intergenic consensus (ERIC), and BOX elements (collectively known as rep-PCR). The survey comprised 24 reference strains and 65 isolates obtained from a field trial in Guadeloupe in 1993. Comparison of the data identified RC-PFGE as the most discriminatory method, delineating 17 pulsed-field gel profile types. rep-PCR and bacteriocin typing identified nine rep-PCR profile types and nine bacteriocin groups. Independent determination of similarity coefficients and clustering of RC-PFGE and rep-PCR data identified six groups common to both sets of data that correlated to biovar and bacteriocin groups. Further study of bacteriocin production in planta gave results consistent with in vitro bacteriocin typing. It was observed that spontaneous bacteriocin-resistant mutants exhibited a cross-resistance to other bacteriocins as identified by the typing scheme and that such mutants possessed a selective advantage for growth over isogenic nonmutants in the presence of a bacteriocin. The results are significant in the search for biological control of disease by nonpathogenic mutants of the wild-type organism.

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