Adhaeribacter aerophilus sp. nov., Adhaeribacter aerolatus sp. nov. and Segetibacter aerophilus sp. nov., isolated from air samples

Abstract

Three bacterial isolates from air samples in Korea, designated strains 6424S-25T, 6515J-31T and 6424S-61T, were characterized using a polyphasic approach. The cells were strictly aerobic, Gram-stain-negative, non-motile, non-spore-forming and rod-shaped. Phylogenetic analysis of their 16S rRNA gene sequences revealed a clear affiliation with the phylum Bacteroidetes. Strains 6424S-25T and 6515J-31T showed 16S rRNA gene sequence similarities of 92.7–94.8 % to type strains of recognized species of the genus Adhaeribacter and strain 6424S-61T was closely related to Segetibacter koreensis Gsoil 664T (93.9 % similarity). The G+C contents of the DNA of strains 6424S-25T, 6515J-31T and 6424S-61T were 44.5, 43.9 and 38.4 mol%, respectively. Major fatty acids of strains 6424S-25T and 6515J-31T were summed feature 4 (iso-C17 : 1 I and/or anteiso-C17 : 1 B), iso-C15 : 0 and C16 : 1 ω5c. The fatty acid content of strain 6424S-61T mainly comprised iso-C15 : 1 G and iso-C15 : 0. Comparative analysis of phenotypic and phylogenetic traits indicated that strains 6424S-25T and 6515J-31T represented two novel species of the genus Adhaeribacter and that strain 6424S-61T should be considered as a novel species of the genus Segetibacter. The names Adhaeribacter aerophilus sp. nov. (type strain 6424S-25T =KACC 14118T =NBRC 106134T), Adhaeribacter aerolatus sp. nov. (type strain 6515J-31T =KACC 14117T =NBRC 106133T) and Segetibacter aerophilus sp. nov. (type strain 6424S-61T =KACC 14119T =NBRC 106135T) are proposed for these organisms.