Pseudoxanthomonas wuyuanensis sp. nov., isolated from saline-alkali soil

A bacterium, designated XC21-2^T, was isolated from a saline-alkaline soil sample from China. Cells were Gram-stain-negative, rod-shaped and motile and grew optimally at 35-37 °C, pH 6.0-7.0 and in the presence of 0.5 % (w/v) NaCl. Growth occurred in the range pH 5.5-9.0 and in the presence of up to 4 % (w/v) NaCl. The major cellular fatty acids were iso-C_{15: 0}, iso-C_{16: 0}and iso-C_{17: 1}ω9c. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and an uncharacterized amino-group-containing polar lipid. The major quinone was ubiquinone 8 (Q-8) and the G+C content of the genomic DNA was 66.2 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain XC21-2^T formed a tight phylogenetic lineage with Pseudoxanthomonas dokdonensis KCTC 12543^T within the genus Pseudoxanthomonas and was most closely related to P. dokdonensis KCTC 12543^T and P. mexicana ATCC 700993^T, with 97.9 and 97.5 % 16S rRNA gene sequence similarity, respectively. On the basis of the unique physiological profile of the isolate and its phylogenetic divergence from known species, strain XC21-2^T represents a novel species within the genus Pseudoxanthomonas, for which the name Pseudoxanthomonas wuyuanensis sp. nov. is proposed. The type strain is XC21-2^T (= CGMCC 1.10978^T = KCTC 23877^T).