Acerihabitans arcticus sp. nov., a first psychrophilic member of the family Pectobacteriaceae and able to reduce Fe(III)

A novel psychrophilic strain TG2 ^T was isolated from an anaerobic enrichment obtained from a tundra soil sample selected on the Bykovsky Peninsula (Russia). Cells were facultatively anaerobic, Gram-stain-negative, non-spore-forming motile short rods. The novel isolate grows at 0–25°C (optimum 8°C), pH 6.0–8.0 (optimum 7.0–7.5), up to 1.0% (w/v) NaCl (optimum 0.1–0.5%). Strain TG2 ^T was a chemoorganoheterotroph. Lactate, acetate and formate were the major products of glucose and pectin fermentation. The major cellular fatty acids were С _16:1 ω8c, С _17:0 cyclo and С _18:0 cyclo. The polar lipids were phosphatidylcholine, phosphatidylethanolamine phosphatidylglycerol, and four unidentified polar lipids. Phylogenomic analysis based on 81 core gene sequences showed that strain TG2 ^T belonged to the family Pectobacteriaceae . The closest phylogenetic neighbor was Acerihabitans arboris SAP-6 ^T (98.2% 16S rRNA gene sequence similarity). The genome of strain TG2 ^T was 5.3 Mbp in size with 51.1 mol% of G + C content. The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between strain TG2 ^T and its closest relative were 78.6 and 22.6%, respectively. Based on the phylogenetic, phenotypic, chemotaxonomic and genomic data, new bacterium represents a novel species of the genus Acerihabitans in the family Pectobacteriaceae , for which the name Acerihabitans arcticus sp. nov. is proposed. The type strain is TG2 ^T (= VKM B-3773 ^T  = JCM 39549 ^T )