title: Taxonomic characterization of Ochrobactrum sp. isolates from soil samples and wheat roots, and description of Ochrobactrum tritici sp. nov. and Ochrobactrum grignonense sp. nov.
abstract: 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 165 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 OgA9aT = LMG 18954T = DSM 13338T). 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 SCII24T = LMG 18957T = DSM 13340T).
authors.forename: M
authors.initials: M
authors.lastname: Lebuhn
authors.forename: W
authors.initials: W
authors.lastname: Achouak
authors.forename: M
authors.initials: M
authors.lastname: Schloter
authors.forename: O
authors.initials: O
authors.lastname: Berge
authors.forename: H
authors.initials: H
authors.lastname: Meier
authors.forename: M
authors.initials: M
authors.lastname: Barakat
authors.forename: A
authors.initials: A
authors.lastname: Hartmann
authors.forename: T
authors.initials: T
authors.lastname: Heulin
mesh_terms: D020561:Alphaproteobacteria / Q000145:classification* / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism; D000907:Antibodies, Bacterial / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D015373:Bacterial Typing Techniques; D004275:DNA, Ribosomal / Q000032:analysis; D005838:Genotype; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010641:Phenotype; D010802:Phylogeny; D018517:Plant Roots / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D014908:Triticum / Q000382:microbiology*
chemical_list: D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S