1887

Abstract

The taxonomic positions of two Gram-staining-negative, psychrophilic bacteria, which were isolated from alpine glacier cryoconite and designated strains Cr4-12 and Cr4-35, were investigated using a polyphasic approach. Both novel strains contained ubiquinone Q-8 as the sole quinone, summed feature 3 (Cω7 and/or Cω6) and C as the dominant cellular fatty acids, putrescine and 2-hydroxyputrescine as the major polyamines, and diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine as the major polar lipids. The genomic DNA G+C contents of strains Cr4-12 and Cr4-35 were 61.3 mol% and 60.7 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the two strains belonged to the genus . Although the 16S rRNA gene sequences of strains Cr4-12 and Cr4-35 were very similar (98.7 % sequence similarity), hybridizations indicated a DNA–DNA relatedness value of only 26.9 % between the two novel strains. In pairwise comparisons with the type strains of recognized species, strains Cr4-12 and Cr4-35 showed 16S rRNA gene sequence similarities of 96.4–98.5 % and 96.5–98.4 %, respectively. Based on the phenotypic and phylogenetic evidence and DNA–DNA relatedness data, strains Cr4-12 and Cr4-35 represent two novel species within the genus , for which the names sp. nov. and sp. nov., respectively, are proposed. The type strain of sp. nov. is Cr4-12 ( = DSM 24062  = LMG 26049  = KACC 15089) and that of sp. nov. is Cr4-35 ( = DSM 24248  = LMG 26050  = KACC 15090).

Funding
This study was supported by the:
  • Aktion D. Swarovski & Co. 2009
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2012-11-01
2024-03-28
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