Open AccessFlavobacterium hydrophilum sp. nov. and Flavobacterium cheongpyeongense sp. nov., isolated from freshwater
Author(s) -
Yochan Joung,
Hye-Jin Jang,
Jaeho Song,
Jang-Cheon Cho
Publication year - 2019
Publication title -
international journal of systematic and evolutionary microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 173
eISSN - 1466-5034
pISSN - 1466-5026
DOI - 10.1099/ijsem.0.003083
Subject(s) - biology , 16s ribosomal rna , flavobacterium , phylogenetic tree , microbiology and biotechnology , phylogenetics , bacteria , strain (injury) , flavobacteriaceae , ribosomal rna , gene , bacteroidetes , genetics , pseudomonas , anatomy
Two Gram-stain-negative, non-motile, yellow-pigmented bacterial strains, designated IMCC34758 T and IMCC34759 T , were isolated from freshwater. Phylogenetic analysis based on 16S rRNA gene sequences showed that the two strains formed a distinct clade within the genus Flavobacterium and they shared 97.9 % sequence similarity. The average nucleotide identity (ANI) and digital DNA-DNA hybridization values (dDDH) between the two strains were 85.5 and 30.2 %, respectively, indicating that they are separate species. The two strains showed ≤98.5 % 16S rRNA gene sequence similarities, 80.6-81.3 % of ANI and 24.7-25.1 % of dDDH values to closely related species of the genus Flavobacterium, indicating that the two strains each represent novel Flavobacteriumspecies. The respiratory quinone detected in both strains was menaquinone-6 (MK-6). The major polar lipids of the two strains were phosphatidylethanolamine, an unidentified aminolipid, an unidentified aminophospholipid and an unidentified polar lipid. The DNA G+C contents of strains IMCC34758 T and IMCC34759 T were 34.0 and 34.1 mol%, respectively. The major fatty acids of the two strains were very similar to each other, comprising iso-C15 : 0, iso-C15 : 1 G, anteiso-C15 : 0 and summed feature 3 (C16 : 1 ω6c and/or C16 : 1 ω7c). Phenotypic characteristics including enzyme activities and carbon source utilization differentiated the two strains from other Flavobacteriumspecies. Based on these results, strains IMCC34758 T and IMCC34759 T were considered to represent novel species in the genus Flavobacterium, for which the names Flavobacterium hydrophilum (IMCC34758 T =KACC 19591 T =NBRC 113423 T ) and Flavobacterium cheongpyeongense (IMCC34759 T =KACC 19592 T =NBRC 113424 T ) are proposed, respectively.