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Pontibacter korlensis sp. nov., isolated from the desert of Xinjiang, China

Lei Zhang, Qiuju Zhang, Xuesong Luo, Yali Tang, Jun Dai, Yaowei Li, Yang Wang, Gong Chen and Chengxiang Fang

College of Life Sciences, Wuhan University, Wuhan 430072, PR China

Correspondence
Chengxiang Fang
cxfang{at}whu.edu.cn

Two Gram-negative, rod-shaped, gliding and pink-pigmented bacterial strains, X14-1^T and X19-1, were isolated from a mixture of sand samples collected from the desert of Xinjiang, China, and characterized by using a polyphasic taxonomic approach. Strains X14-1^T and X19-1 contained MK-7 as the predominant menaquinone. The major cellular fatty acids included iso-C_{15 : 0}, iso-C_{17 : 0} 3-OH, summed feature 3 and summed feature 4. The DNA G+C contents of strains X14-1^T and X19-1 were 48.2 and 48.9 mol%, respectively. 16S rRNA gene sequence analysis showed that the isolates were highly related to each other (99.2 %) and confirmed their placement in the genus Pontibacter. Strains X14-1^T and X19-1 exhibited 16S rRNA gene similarity levels of 95.0–97.2 % to the type strains of the two Pontibacter species with validly published names. DNA–DNA hybridization experiments revealed a high level of relatedness between the two new isolates (82 %), but low levels of relatedness between strain X14-1^T and the phylogenetically most closely related species Pontibacter actiniarum KMM 6156^T (51 %). On the basis of genotypic and phenotypic evidence, strains X14-1^T and X19-1 are considered to represent a novel species of the genus Pontibacter, for which the name Pontibacter korlensis sp. nov. is proposed. The type strain is X14-1^T (=CCTCC AB 206081^T=NRRL B-51097^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains X14-1^T and X19-1 are DQ888330 and DQ888331, respectively.

A transmission electron micrograph of cells of strain X14-1^T is available as a supplementary figure with the online version of this paper.