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Taxonomic study of Cellvibrio strains and description of Cellvibrio ostraviensis sp. nov., Cellvibrio fibrivorans sp. nov. and Cellvibrio gandavensis sp. nov.

¹ Laboratorium voor Microbiologie, Vakgroep Biochemie, Fysiologie en Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
² BCCM/LMG Bacteria Collection, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
³ Department of Biology and Ecology, University of Ostrava, Bráfova 7, CS-70103 Ostrava 1, Czech Republic

Correspondence
Jean Swings
jean.swings{at}rug.ac.be

Thirty-one cellulolytic bacterial isolates from soils that were phenotypically very similar and phylogenetically highly related to Cellvibrio strains were further characterized using a polyphasic taxonomic approach. By using repetitive extragenic palindromic DNA-PCR fingerprinting, six different fingerprints could be recognized among the isolates. Representative strains and four reference strains of the genus Cellvibrio were used for DNA–DNA hybridization, which yielded eight DNA hybridization groups at a cut-off level of 70 % DNA binding. One group was formed by three isolates and Cellvibrio vulgaris LMG 2848^T and a second group consisted of Cellvibrio mixtus strains ACM 2601^T and ACM 2603. Two isolates and Cellvibrio fulvus LMG 2847^T constituted single-member groups. For the remaining groups, three novel species are proposed: Cellvibrio fibrivorans sp. nov. (six strains, type strain LMG 18561^T =ACM 5172^T), Cellvibrio ostraviensis sp. nov. (eight strains, type strain LMG 19434^T =ACM 5173^T) and Cellvibrio gandavensis sp. nov. (12 strains, type strain LMG 18551^T =ACM 5174^T). The novel Cellvibrio species could be differentiated from each other and from C. mixtus, C. vulgaris and C. fulvus on the basis of phenotypic features, their fatty acid compositions and the G+C content of their DNA.

Published online ahead of print on 19 September 2002 as DOI 10.1099/ijs.0.02316-0.

The GenBank/EMBL accession numbers for the 16S rDNA sequences of strains LMG 18551^T, LMG 18561^T and LMG 19434^T are AJ289162, AJ289164 and AJ493583.

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