Pontibacter terrae sp. nov., isolated from soil

Pontibacter kalidii sp. nov., isolated from rhizosphere soil of Kalidium foliatum

A Gram-negative, aerobic, gliding motile, rod-shaped bacterium, designated XAAS-72T, was isolated from the rhizosphere soil of Kalidium foliatum sampled in the Xinjiang Uyghur Autonomous Region, PR China. Cells grew at 4-45 °C, pH 5.0-8.0 and 0-8% NaCl, with optimal growth at 20-30 °C, pH 6.0-7.0 and 1-2 % NaCl. Strain XAAS-72T is closely related to members of the genus Pontibacter, namely Pontibacter korlensis CCTCC AB 206081T (97.6%) and Pontibacter flavimaris ACCC 19859T (97.2 %), and <94.6 % related to other currently described Pontibacter strains. The average nucleotide identity values between XAAS-72T and P. korlensis CCTCC AB 206081T and P. flavimaris ACCC 19859T were 77.9 and 86.9 %, respectively; the corresponding digital DNA-DNA hybridization values were 21.7 and 31.8 %. Menaquinone-7 was the predominant respiratory menaquinone. The polar lipids consisted of phosphatidylethanolamine, two unidentified aminophospholipids, two unidentified glycolipids and five unidentified lipids. The major cellular fatty acids were summed feature 4 (containing iso-C17 : 1 I/anteiso-C17 : 1 B), summed feature 3 (containing C16 : 1  ω7c/C16 : 1  ω6c) and iso-C15 : 0. The genome length of strain XAAS-72T was 5 054 860 bp with a genomic DNA G+C content of 54.5 mol%. The phenotypic and genotypic data suggest that strain XAAS-72T represents a novel species of the genus Pontibacter, for which the name Pontibacter kalidii sp. nov. is proposed. The strain is XAAS-72T (CGMCC 16594T=KCTC 72095T).

Pontibacter liquoris sp. nov. and Pontibacter vulgaris sp. nov., two novel bacteria isolated from the pit mud of Chinese liquor

Two pink-pigmented bacterial strains, designated NBU2971^T and NBU2972^T, were isolated from the pit mud of a Chinese liquor. Phylogenetic analyses based on 16S rRNA gene sequences suggested that strains NBU2971^T and NBU2972^T formed a distinct lineage within the family Hymenobacteraceae and were closely related to members of the genus Pontibacter. 16S rRNA gene sequences revealed that strain NBU2971^T showed highest similarity of 97.9 % to Pontibacter arcticus 2b14^T, and strain NBU2972^T showed the highest similarity of 96.9 % to Pontibacter deserti JC215^T. The 16S rRNA gene sequence similarity, average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between the two novel strains were 95.2, 73.8 and 19.6 %, respectively, suggesting that they represent different species. The ANI and dDDH values between two novel strains and related species of genus Pontibacter were well below the threshold limit for prokaryotic species delineation. The genomic DNA G+C contents of strains NBU2971^T and NBU2972^T were 51.3 and 44.5 mol%, respectively. The major cellular fatty acids of the two novel strains were iso-C_15 : 0 and summed feature 4 (iso-C_17 : 1 I and/or anteiso-C_17 : 1 B). The major polar lipid of both novel strains was phosphatidylethanolamine. The only respiratory quinone was MK-7. Combining results of phenotypic, chemotaxonomic and genotypic data, strains NBU2971^T and NBU2972^T are considered to be two representatives in the genus Pontibacter, which the name Pontibacter liquoris sp. nov. and Pontibacter vulgaris sp. nov. are proposed. The type strains of the new species are NBU2971^T (=KCTC 82916^T=MCCC 1K06395^T) and NBU2972^T (=KCTC 82917^T=MCCC 1K06396^T), respectively.

Pontibacter arcticus sp. nov., isolated from rhizosphere soil of Saxifraga oppositifolia

A Gram-stain-negative, rod-shaped, red-coloured and aerobic bacterium, designated 2b14^T, was isolated from rhizosphere soil of Saxifraga oppositifolia sampled at the Chinese Arctic Yellow River Station in Norway. Optimal growth occurred at 28 °C (range, 4-37 °C) and pH 7.0-7.5 (pH 6.5-8.5). The strain could tolerate up to 2.5 % (w/v) NaCl concentration. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain 2b14^Thad the highest similarity value of 96.0 % to Pontibacter diazotrophicus CCTCC AB 2013049^T. The major fatty acids were summed feature 4 (anteiso-C_17 : 1 B and/or iso-C_17 : 1 I), iso-C_15 : 0 and iso-C_17 : 0 3-OH. The major polar lipid was found to be phosphatidylethanolamine. The genomic DNA G+C content of strain 2b14^T was 45.5 mol%. The sole respiratory quinone was MK-7. The combined results of physiological, genotypic, phylogenetic and chemotaxonomic analyses showed that strain 2b14^T represents a novel species within the genus Pontibacter, for which the name Pontibacter arcticus sp. nov. is proposed. The type strain is 2b14^T (=KCTC 62596^T=MCCC 1H00304^T).