Abstract

The study isolated a Gram-negative, rod-shaped, non-motile bacterium from the soil of a ginseng field in Daejeon, South Korea and characterized it to determine its taxonomic position. Phylogenetic analysis, based on the 16S rRNA gene sequence, revealed that strain MK06T belongs to the family Xanthomonadacea, and showed the highest degree of sequence similarity to Stenotrophomonas rhizophila e-p10T (98.6%), Xanthomonas campestris LMG 568T (98.0%), Stenotrophomonas maltophilia ATCC 1d3637T (97.3%), and Stenotrophomonas humi R-32729T (96.9%). Chemotaxonomic data revealed that strain MK06T possesses ubiquinone Q-8 as the predominant respiratory lipoquinone, which is common in the genus tenotrophomonas, and that the predominant fatty acids were 15:0 iso (41.1%), 15:0 anteiso (12.6%), and 17:1 iso ω9c (8.6%). The results of physiological and biochemical tests clearly demonstrated that strain MK06T represents a distinct species and supported its affiliation with the genus Stenotrophomonas. Based on these data, MK06T (KCTC, 22893T; JCM, 16536T; KEMB, 9004-002T) should be classified as the type strain for a novel species, for which we propose the name Stenotrophomonas panacihumi sp. nov.

• Keywords: 16S rRNA gene; S. panacihumi; taxonomy; Xanthomonadaceae