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Lactobacillus concavus sp. nov., isolated from the walls of a distilled spirit fermenting cellar in China

State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, P. R. China

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

Two novel Lactobacillus strains, C-5-1^T and HB5, were isolated from the walls of a distilled spirit fermenting cellar in Hebei province, China. The strains were Gram-positive, non-spore-forming, non-motile curved rods and were facultatively anaerobic. They produced 5 % (–)-D/95 % (+)-L lactic acid exclusively from glucose fermentation, but were catalase-negative. Both strains fermented N-acetylglucosamine, arbutin, salicin, cellobiose, maltose, trehalose and -gentiobiose. The mean DNA G+C content of the two strains was 46·9±0·8 mol% (46·4 mol% for the type strain, C-5-1^T). Phylogenetic analysis based on 16S rRNA gene sequence similarity showed that strain C-5-1^T was clustered in the Lactobacillus casei/Pediococcus phylogenetic group and was closely related to Pediococcus dextrinicus JCM 5887^T (97·9 % similarity), followed by Lactobacillus algidus JCM 10491^T (93·9 % similarity). The DNA–DNA relatedness between the type strain C-5-1^T and P. dextrinicus JCM 5887^T and L. algidus JCM 10491^T was only 5·4 and 4·3 %, respectively. Therefore, based on phenotypic, genotypic and phylogenetic analyses, a novel Lactobacillus species, Lactobacillus concavus sp. nov., is proposed. The type strain is C-5-1^T (=AS 1.5017^T=LMG 22739^T).

Published online ahead of print on 10 June 2005 as DOI 10.1099/ijs.0.63509-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Lactobacillus concavus sp. nov. AS 1.5017^T is AY683322.

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