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International Journal of Systematic and Evolutionary Microbiology, Vol 50, 2207-2223, Copyright © 2000 by Society for General Microbiology
M Lebuhn, W Achouak, M Schloter, O Berge, H Meier, M Barakat, A Hartmann and T Heulin
DSV-DEVM, Laboratoire d'Ecologie Microbienne de la Rhizosphere, UMR163 CNRS-CEA, CEA Cadarache, F-13108 St Paul lez Durance, France
A large collection of bacterial strains, immunotrapped from soil and from the wheat rhizoplane, was subjected to polyphasic taxonomy by examining various pheno- and genotypic parameters. Strains were grouped on (inter) repetitive extragenic palindromic DNA (REP) PCR profiles at the intraspecies level. Pheno- and genotypic characters were assessed for representatives from 13 different REP groups. Strains of nine REP groups constituting two physiological BIOLOG clusters fell in the coherent DNA--DNA reassociation group of Ochrobactrum anthropi. Strains of two REP groups constituting a separate BIOLOG cluster fell in the coherent DNA--DNA reassociation group of Ochrobactrum intermedium. Additional phenotypic characters differentiating O. anthropi and O. intermedium were found. REP group K strains constituted a different BIOLOG cluster, a separate DNA--DNA reassociation group and a distinct phylogenetic lineage in 16S rDNA homology analysis, indicating that REP group K strains represent a new species. Diagnostic phenotypic characters were found. Closest relatives were Ochrobactrum species. The name Ochrobactrum grignonense sp. nov. is proposed (type strain OgA9a(T)=LMG 18954(T)=DSM 13338(T)). REP group J strains again constituted a different BIOLOG cluster, a separate DNA--DNA reassociation group and showed, as a biological particularity, a strict preference for the rhizoplane as habitat. Diagnostic phenotypic characters were found. This indicated that REP group J strains represent a further new species, although phylogenetic analyses using 16S rDNA homology were not able to separate the cluster of REP group J sequences significantly from 16S rDNA sequences of Ochrobactrum anthropi. The name Ochrobactrum tritici sp. nov. is proposed (type strain SCII24(T) = LMG 18957(T)= DSM 13340(T)).
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