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Int J Syst Evol Microbiol 59 (2009), 2080-2083; DOI  10.1099/ijs.0.007641-0
© 2009 International Union of Microbiological Societies

Selenomonas bovis sp. nov., isolated from yak rumen contents

Kegui Zhang1,2 and Xiuzhu Dong1

1 State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
2 Graduate University, Chinese Academy of Sciences, Beijing 100049, PR China

Correspondence
Xiuzhu Dong
dongxz{at}sun.im.ac.cn

Two strictly anaerobic, crescent-shaped bacterial strains, designated WGT and Ycb08, were isolated from a cellulose-degrading mixed culture enriched from yak rumen contents. The strains were Gram-negative, non-spore-forming and motile, with four to six flagella situated at the centre of the concave side of the cell. The cells were 0.9–1.1x4–6 µm. Growth was observed at 27–46 °C (optimum 39 °C) and pH 4.2–8.3 (optimum pH 7.0–7.2). Arabinose, glucose, mannose, cellobiose, lactose, sucrose, trehalose, melibiose, raffinose, salicin and aesculin were fermented. The end products of glucose fermentation were acetate, propionate and CO2. The G+C contents of strains WGT and Ycb08 were respectively 63.9±0.2 and 62.5±0.2 mol% (Tm). Phylogenetic analysis based on 16S rRNA gene sequences revealed that the two strains were related to the genera Mitsuokella and Selenomonas at similarity levels below 97 %; however, they differed from members of the genus Mitsuokella in their flagellar arrangement. On the basis of phenotypic, genotypic and physiological evidence, strains WGT and Ycb08 are identified as members of a novel species of the genus Selenomonas, for which the name Selenomonas bovis sp. nov. is proposed. The type strain is WGT (=CGMCC 1.5073T =JCM 15470T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains WGT and Ycb08 are respectively EF139191 and EU821596.

A transmission electron micrograph of a cell of strain WGT is available as supplementary material with the online version of this paper.






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