Salinivirga fredricksonii gen. nov., sp. nov., a heterotrophic halophile isolated from a photosynthetic mat, a member of a novel lineage (Salinarimonadaceae fam. nov.) within the order Rhizobiales, and reclassification of the genus Salinarimonas Liu et al. 2010 into Salinarimonadaceae

• Published in: International journal of systematic and evolutionary microbiology Vol. 68; no. 5; pp. 1591 - 1598
• Main Authors: Cole, Jessica K, Morton, Beau R, Cardamone, Hayley C, Lake, Hannah R R, Dohnalkova, Alice C, Kim, Young-Mo, Kyle, Jennifer E, Maezato, Yukari, Dana, Karl L, Metz, Thomas O, Romine, Margaret F, Nelson, William C, Lindemann, Stephen R
• Format: Journal Article
• Language: English
• Published: England International Union of Microbiological Societies 01.05.2018
• ISSN: 1466-5026; 1466-5034
• DOI: 10.1099/ijsem.0.002715

A halophilic bacterial strain, HL-109 , was isolated from the unicyanobacterial consortium UCC-O, which was obtained from the photosynthetic mat of Hot Lake (Washington, USA). A polyphasic approach using phenotypic, genotypic and chemotaxonomic data was used to classify the strain within the order Rhizobiales. The organism stained Gram-negative and was a moderate thermophile with a growth optimum of 45 °C. It was obligately aerobic, heterotrophic and halophilic, growing in both NaCl and MgSO4 brines. The novel isolate had a polymorphic cellular morphology of short rods with occasional branching, and cells were monotrichous. The major fatty acids detected were C18 : 1, C18 : 0, C16 : 0 and C18 : cyc. Phylogenetic analysis of the 16S rRNA gene placed the strain in the order Rhizobiales and it shared 94 % identity with the type strain of its nearest relative, Salinarimonas ramus. Morphological, chemotaxonomic and phylogenetic results did not affiliate the novel organism with any of the families in the Rhizobiales; therefore, HL-109 is representative of a new lineage, for which the name Salinivirga fredricksonii gen. nov., sp. nov. is proposed, with the type strain HL-109 (=JCM 31876 =DSM 102886 ). In addition, examination of the phylogenetics of strain HL-109 and its nearest relatives, Salinarimonas ramus and Salinarimonasrosea, demonstrates that these halophiles form a clade distinct from the described families of the Rhizobiales. We further propose the establishment of a new family, Salinarimonadaceae fam. nov., to accommodate the genera Salinivirga and Salinarimonas (the type genus of the family).