Sphingomonas glacialis sp. nov., a psychrophilic bacterium isolated from alpine glacier cryoconite
A non-motile, rod-shaped, yellow bacterium, designated C16yT, was isolated from alpine glacier cryoconite. Cells behaved Gram-positively, were aerobic and psychrophilic (good growth at 1–25 °C). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain C16yT was related to the genus Sphingomonas and had highest 16S rRNA gene sequence similarity with Sphingomonas oligophenolica JCM 12082T (97.6 %) and Sphingomonas echinoides DSM 1805T (97.2 %). DNA–DNA hybridization demonstrated that strain C16yT could not be considered as a member of either Sphingomonas oligophenolica or Sphingomonas echinoides. Strain C16yT contained Q-10 as the predominant ubiquinone and C18 : 1 and C16 : 0 were the dominant fatty acids. The polar lipid profile contained phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, sphingoglycolipid, five unidentified glycolipids, two unidentified aminophospholipids and two unidentified lipids. The major polyamines were the triamines sym-homospermidine and spermidine. The G+C content was 67.9 mol%. Combined data from phenotypic, phylogenetic and DNA–DNA relatedness studies demonstrated that strain C16yT is a representative of a novel species of the genus Sphingomonas, for which we propose the name Sphingomonas glacialis sp. nov. The type strain is C16yT (=DSM 22294T =CGMCC 1.8957T =CIP 110131T).