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Int J Syst Evol Microbiol 58 (2008), 1426-1431; DOI  10.1099/ijs.0.65407-0
© 2008 International Union of Microbiological Societies

Ochrobactrum rhizosphaerae sp. nov. and Ochrobactrum thiophenivorans sp. nov., isolated from the environment

Peter Kämpfer1, Angela Sessitsch2, Michael Schloter3, Birgit Huber4, Hans-Jürgen Busse4 and Holger C. Scholz5

1 Institut für Angewandte Mikrobiologie, Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany
2 Austrian Research Centers GmbH, Department of Bioresources, A-2444 Seibersdorf, Austria
3 Helmholtz Zentrum München, German Research Center for Environmental Health, Terrestrial Ecogenetics, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany
4 Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität Wien, A-1210 Wien, Austria
5 Bundeswehr Institute of Microbiology, D-80937 Munich, Germany

Correspondence
Peter Kämpfer
peter.kaempfer{at}umwelt.uni-giessen.de

Two Gram-negative, rod-shaped, non-spore-forming bacteria, PR17T and DSM 7216T, isolated from the potato rhizosphere and an industrial environment, respectively, were studied for their taxonomic allocation. By rrs (16S rRNA) gene sequencing, these strains were shown to belong to the Alphaproteobacteria, most closely related to Ochrobactrum pseudogrignonense (98.4 and 99.3 % similarity to the type strain, respectively). Chemotaxonomic data (major ubiquinone Q-10; major polyamines spermidine, sym-homospermidine and putrescine; major polar lipids phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidylglycerol and phosphatidylcholine and the Ochrobactrum-specific unidentified aminolipid AL2; major fatty acids C18 : 1{omega}7c and C19 : 0 cyclo {omega}8c) supported the genus affiliation. The results of DNA–DNA hybridization and physiological and biochemical tests allowed genotypic and phenotypic differentiation of the isolates from all hitherto-described Ochrobactrum species. Hence, both isolates represent novel species of the genus Ochrobactrum, for which the names Ochrobactrum rhizosphaerae sp. nov. (type strain PR17T =CCUG 55411T =CCM 7493T =DSM 19824T) and Ochrobactrum thiophenivorans sp. nov. (type strain DSM 7216T =CCUG 55412T =CCM 7492T) are proposed.

Abbreviations: pNA, p-nitroanilide; pNP, p-nitrophenyl

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains PR17T and DSM 7216T are respectively AM490632 and AM490617.






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