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Int J Syst Evol Microbiol 59 (2009), 2552-2560; DOI  10.1099/ijs.0.008383-0
© 2009 International Union of Microbiological Societies

Dissection of the genus Methylibium: reclassification of Methylibium fulvum as Rhizobacter fulvus comb. nov., Methylibium aquaticum as Piscinibacter aquaticus gen. nov., comb. nov. and Methylibium subsaxonicum as Rivibacter subsaxonicus gen. nov., comb. nov. and emended descriptions of the genera Rhizobacter and Methylibium

Erko Stackebrandt1, Susanne Verbarg1, Anja Frühling1, Hans-Jürgen Busse2 and Brian J. Tindall1

1 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstr. 7B, D-38124 Braunschweig, Germany
2 Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität Wien, Veterinärplatz 1, A-1210 Wien, Austria

Correspondence
Erko Stackebrandt
erko{at}dsmz.de

16S rRNA gene sequenced-based phylogeny indicates that Rhizobacter dauci ATCC 43778T branches within the radiation of Methylibium type strains. A comparative chemotaxonomic study including fatty acid methyl esters, polar lipids and polyamines reveals significant differences that, in combination with the topology of phylogenetic trees, support a dissection of the genus Methylibium. The proposals of this study include the transfer of Methylibium fulvum to the genus Rhizobacter as Rhizobacter fulvus comb. nov. (type strain Gsoil 322T =KCTC 12591T =DSM 19916T) and the reclassification of Methylibium aquaticum as Piscinibacter aquaticus gen. nov., comb. nov. (the type strain of Piscinibacter aquaticus is IMCC1728T =KCCM 42364T =NBRC 102349T =DSM 19915T) and of Methylibium subsaxonicum as Rivibacter subsaxonicus gen. nov., comb. nov. (the type strain of Rivibacter subsaxonicus is BF49T =DSM 19570T =CIP 109700T). As a consequence of these reclassifications, emended descriptions of the genera Methylibium and Rhizobacter are provided.

Profiles of fatty acids, polyamines and polar lipids of type strains of Methylibium species and R. dauci are available as supplementary material with the online version of this paper.






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