Hymenobacter sediminis sp. nov., isolated from lake sediment

Hymenobacter canadensis sp. nov., isolated from freshwater of the pond in Cambridge Bay, Canada

A Gram-stain-negative, aerobic, reddish-coloured, rod-shaped and non-motile strain PAMC 29467^T, was isolated from freshwater of the pond in Cambridge Bay, Canada. Strain PAMC 29467^T was closely related to Hymenobacter yonginensis (98.1 % 16S rRNA gene similarity). Genomic relatedness analyses showed that strain PAMC 29467^T is distinguishable from H. yonginensis based on average nucleotide identity (91.3 %) and digital DNA-DNA hybridization values (39.3 %). The major fatty acids (>10 %) of strain PAMC 29467^T were summed feature 3 (C_16 : 1  ω7c and/or C_16 : 1  ω6c), C_15 : 0 iso, C_16 : 1  ω5c and summed feature 4 (C_17 : 1 iso l and/or anteiso B). The major respiratory quinone was menaquinone-7. The genomic DNA G+C content was 61.5 mol%. Strain PAMC 29467^T was separated from the type species in the genus Hymenobacter by its distinct phylogenetic position and some physiological characteristics. As a result, a novel species is proposed, with the name Hymenobacter canadensis sp. nov. (type strain, PAMC 29467^T=KCTC 92787^T=JCM 35843^T).

Hymenobacter translucens sp. nov. and Hymenobacter pini sp. nov. isolated from soil

Two novel bacterial strains BT175^T and BT728^T were isolated from soil collected in the Republic of Korea. Both strains were Gram stain negative, rod shaped, and had circular, convex, and pink-colored colonies. The 16S rRNA gene sequence similarity between the strains BT175^T and BT728^T was 93.6%, indicating that they represent a distinct species. 16S rRNA sequence analysis indicated that strains BT175^T and BT728^T belong to a distinct lineage within the genus Hymenobacter (family Hymenobacteraceae, order Cytophagales, class Cytophagia, phylum Bacteroidetes). Strain BT175^T was closely related to Hymenobacter persicinus 1-3-3-3^T (97.2%, 16S rRNA gene similarity), Hymenobacter knuensis 16F7C-2^T (96.6%), and Hymenobacter daejeonensis PB105^T (96.1%). Strain BT728^T was closely related to Hymenobacter rigui KCTC 12533^T (98.4%), Hymenobacter metallilatus 9PBR-2^T (97.6%), and Hymenobacter perfusus LMG26000^T (97.4%). Strain BT175^T and BT728^T were found to have the MK-7 as the major respiratory quinone. The DNA G + C content of strain BT175^T was 61.6 mol% and BT728^T was 59.6 mol%, respectively. Characterization based on polyphasic analysis indicated that strains BT175^T and BT728^T represent novel species of the genus Hymenobacter and the names Hymenobacter translucens sp. nov. and Hymenobacter pini sp. nov. are proposed. The type strain of Hymenobacter translucens is BT175^T (= KCTC 72330^T = NBRC 115441^T) and Hymenobacter pini is BT728^T (= KACC 22629^T = NBRC 115444^T).

Hymenobacter telluris sp. nov., isolated from soil in South Korea

Two novel bacterial strains, designated as BT186^T and BT505, were isolated from a soil sample collected in South Korea and characterized. Both strains were Gram-stain-negative, rod-shaped, aerobic, circular, convex, and had red-colored colonies. The level of 16S rRNA gene sequence similarity between the strains BT186^T and BT505 was 100%, indicating that they represent an identical species. 16S rRNA sequence analysis indicated that strains BT186^T and BT505 belong to a distinct lineage within the genus Hymenobacter (family Hymenobacteraceae, order Cytophagales, class Cytophagia, phylum Bacteroidetes, Kingdom Bacteria). Both strains were closely related to Hymenobacter norwichensis DSM 15439^T (98.3% 16S rRNA gene similarity), Hymenobacter aquaticus JCM 31653^T (96.8%), and Hymenobacter perfusus LMG26000^T (96.5%). Strain BT186^T was found to have the MK-7 as the major respiratory quinone. The major polar lipid of strain BT186^T was identified to be phosphatidylethanolamine (PE). The major cellular fatty acid profiles of strain BT186^T were C_16:1 ω5c (24.3%), iso-C_15:0 (20.3%) and summed feature 3 (C_16:1 ω6c/C_16:1 ω7c) (19.9%). Characterization based on polyphasic analysis indicated that strains BT186^T and BT505 represent novel species of the genus Hymenobacter and the name Hymenobacter telluris sp. nov. is proposed. The type strain of Hymenobacter telluris is BT186^T (= KCTC 72338^T = NBRC 114968^T).

Hymenobacter properus sp. nov., Hymenobacter ruricola sp. nov., and Hymenobacter jeongseonensis sp. nov., three new species isolated from mountain and beach soil in South Korea

Three Gram-stain-negative, aerobic, circular, convex, red-colored and rod-shaped bacterial strains, designated BT439^T, BT662^T and BT683^T were obtained from soil collected in South Korea. The phylogenetic analysis based on 16S rRNA gene sequences of the strains revealed a distinct lineage within the genus Hymenobacter. The complete genome sequence of strains BT439^T, BT662^T and BT683^T is 5,542,738 bp, 5,964,541 bp, and 5,192,601 bp size, respectively. All three strains were found to have MK-7 as the major respiratory quinone. The major polar lipids of strains BT439^T and BT662^T were identified as phosphatidylethanolamine, aminophospholipids and amino lipids. Strain BT683^T contained phosphatidylethanolamine. The major cellular fatty acids of strain BT439^T were iso-C_15:0, summed feature 3 (C_16:1 ω6c/C_16:1 ω7c) and anteiso-C_15:0; strain BT662^T possessed iso-C_15:0 and summed feature 3 (C_16:1 ω6c/C_16:1 ω7c); strain BT683^T were summed feature 3 (C_16:1 ω6c/C_16:1 ω7c), C_16:1 ω5c, iso-C_15:0 and anteiso-C_15:0. Based on the polyphasic analysis, strains BT439^T, BT662^T and BT683^T can be suggested as three novel bacterial species within the genus Hymenobacter and the proposed names are Hymenobacter properus sp. nov., Hymenobacter ruricola sp. nov. and Hymenobacter jeongseonensis sp. nov., respectively. The type strain of Hymenobacter properus is BT439^T (= KCTC 72900^T = NBRC 114849^T), Hymenobacter ruricola is BT662^T (= KACC 21966^T = NBRC 114855^T) and the type strain of Hymenobacter jeongseonensis is BT683^T (= KACC 22013^T = NBRC xxxxx^T).

Spirosoma aureum sp. nov., and Hymenobacter russus sp. nov., radiation-resistant bacteria in Cytophagales order isolated from soil

A Gram-stain-negative, aerobic, nonmotile, yellow-colored strain BT328^T and Gram-stain-negative, aerobic, non-motile, red-colored strain BT18^T were isolated from the soil collected in Korea. Phylogenetic analyses based on 16S rRNA gene sequence revealed that strain BT328^T formed a distinct lineage within the family Spirosomaceae (order Cytophagales, class Cytophagia) and was most closely related to a member of the genus Spirosoma, Spirosoma terrae 15J9-4^T (95.9% 16S rRNA gene sequence similarity). Optimal growth occurred at 25 °C, pH 7.0 and in the absence of NaCl. The predominant cellular fatty acids were summed feature 3 (C_16:1 ω6c/C_16:1 ω7c) and C_16:1 ω5c. The major respiratory quinone was MK-7. The major polar lipid was phosphatidylethanolamine. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain BT18^T formed a distinct lineage within the family Hymenobacteraceae (order Cytophagales, class Cytophagia, phylum Bacteroidetes) and was most closely related to members of the genus Hymenobacter, Hymenobacter knuensis 16F7C-2^T (97.0% 16S rRNA gene sequence similarity). Optimal growth occurred at 25 °C and pH 7.0 without NaCl. The major fatty acids were iso-C_15:0 and anteiso-C_15:0. The major menaquinone was MK-7. The major polar lipid was phosphatidylethanolamine. Biochemical, chemotaxonomic and phylogenetic analyses indicated that strains BT328^T and BT18^T represents a novel bacterial species within the genus Spirosoma and Hymenobacter, respectively. For which the name Spirosoma aureum and Hymenobacter russus is proposed. The type strain of S. aureum is BT328^T (=KCTC 72365^T = NBRC 114506^T) and the type strain of H. russus is BT18^T (=KCTC 62610^T = NBRC 114380^T).

Hymenobacter polaris sp. nov., a psychrotolerant bacterium isolated from an Arctic station

A pink-pigmented, non-motile, Gram-stain-negative, rod-shaped bacterium, designated RP-2-7^T, was obtained from soil sampled at the Arctic station, Spitsbergen, Svalbard, Norway. Cells were strictly aerobic, psychrotolerant, grew optimally at 15-20 °C and hydrolysed CM-cellulose. Phylogenetic analysis based on its 16S rRNA gene sequence revealed that strain RP-2-7^T formed a lineage within the family Hymenobacteraceae and clustered with members of the genus Hymenobacter. Its closest relative was Hymenobacter marinus KJ035^T (97.6 % sequence similarity). The sequence similarities to other strains were ≤96.9 %. The principal respiratory quinone was MK-7 and the major polar lipids were phosphatidylethanolamine and an unidentified aminophospholipid. The predominant cellular fatty acids were summed feature 3 (C_16 : 1  ω7c and/or C_16 : 1  ω6c), anteiso-C_15 : 0, iso-C_15 : 0, C_16 : 1  ω5c and summed featured 4 (iso-C_17 : 1 I and/or anteiso-C_17 : 1 B). The DNA G+C content was 62.8 mol%. In addition, the average nucleotide identity and in silico DNA-DNA hybridization relatedness values between strain RP-2-7^T and closely related strains were lower than species demarcation thresholds. Based on the resuls of genomic, chemotaxonomic, phenotypic and phylogenetic analyses, strain RP-2-7^T represents novel species in the genus Hymenobacter, for which the name Hymenobacter polaris sp. nov. is proposed. The type strain is RP-2-7^T (=KACC 21670^T=NBRC 114391^T).