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- W2056070211 abstract "Fifteen luminous bacterial strains were isolated from the Tyrrhenian Sea coastal waters off northeastern Sicily and characterised by a combination of phenotypic and molecular tests in order to identify them and to determine their intraspecific genetic variability. Five luminous type strains, Vibrio splendidus NCIMB 1, V. harveyi NCIMB 1280 V. fischeri NCIMB 1281 V. orientalis NCIMB 2195 and Photobacterium leiognathi NCIMB 2193, were used as reference. On the basis of their phenotypic characters, the isolates were assigned to the family Vibrionaceae and all were related to the V. harveyi reference strain. Amplified 16S ribosomal DNA restriction analysis (ARDRA) enabled the strains to be subdivided into three groups, two of which exhibited the same restriction pattern as the two reference strains, V. harveyi and V. splendidus. Comparison of the full 16S rDNA sequence and of a 100-bp highly variable 16S rDNA region (selected as a 'signature' sequence for the luminous bacteria) confirmed ARDRA data and suggested that the strains of the third group could be considered a subspecies of V. harveyi or a tyrrhenian biovar, different from the other reference strains whose 16S rDNAs have already been sequenced. Random amplified polymorphic DNA (RAPD) fingerprinting and analysis of plasmid content suggested a high degree of intraspecific genetic variability within the largest ARDRA group. Data obtained suggest that the ARDRA method and the sequencing of the 16S rDNA signature region could be a powerful tool for a rapid identification of marine luminous bacteria. Méthode polyphasique pour la caractérisation de bactéries marines luminescentes. Quinze souches de bactéries luminescentes ont été isolées des eaux de la mer Tyrrhénienne, près des côtes nord-orientales de la Sicile. Elles ont été identifiées par des méthodes phénotypiques et moléculaires, à l'aide des souches luminescentes de référence : Vibrio splendidus NCIMB 1, V. harveyi NCIMB 1280, V. fischeri NCIMB 1281, V. orientalis NCIMB 2195 et Photobacterium leiognathi NCIMB 2193. Les caractères phénotypiques des souches isolées ont démontré leur appartenance à la famille des Vibrionaceae et leur corrélation à la souche de référence V. harveyi. L'ARDRA a permis de répartir les souches entre trois groupes ; deux de ces groupes montrent un profil identique à celui des souches de référence V. harveyi et V. splendidus. Le séquençage de l'ADN ribosomique 16S entier et d'une partie très variable de 100 bases (choisie comme séquence-signature pour les bactéries luminescentes) a confirmé les résultats précédents. On pourrait aussi faire l'hypothèse selon laquelle le troisième groupe de souches représente une sous-espèce de V. harveyi ou un biovar tyrrhénien, différent des souches de référence dont l'ADNr 16S a été séquencé. La méthode RAPD et l'analyse des plasmides ont démontré un fort degré de variabilité génétique intraspécifique. Les résultats obtenus suggèrent que la méthode ARDRA et le séquençage de la région signature de l'ADNr pourraient être un moyen très valide pour identifier rapidement les bactéries marines luminescentes." @default.
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- W2056070211 title "Polyphasic approach to the characterisation of marine luminous bacteria" @default.
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- W2056070211 doi "https://doi.org/10.1016/s0923-2508(99)80039-4" @default.
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