Sejongia antarctica gen. nov., sp. nov. and Sejongia jeonii sp. nov., isolated from the Antarctic.

Two yellow-pigmented, Gram-negative and aerobic bacterial strains, designated AT1013T and AT1047T, were isolated from terrestrial samples of the Antarctic. On the basis of 16S rRNA gene sequence analyses, the two Antarctic strains shared 97.7 % sequence similarity and showed moderate relationships to the genera Chryseobacterium (92.5-95.3 %), Riemerella (92.3-93.5 %), Bergeyella (92.5-92.6 %) and Kaistella (92.5-93.3 %). In phylogenetic analyses, the two isolates formed a robust monophyletic clade and represented a distinct phyletic line that equated to novel generic status. Cells were non-motile, non-gliding and psychrotolerant with an optimum growth temperature of about 20 degrees C. Flexirubins were absent. The major isoprenoid quinone was MK-6. The predominant cellular fatty acids were 15 : 0 iso, 15 : 0 anteiso and 17 : 1 iso omega9c. DNA G+C contents were 34-36 mol%. The two isolates shared low genomic relatedness (27 %) and were differentiated from each other by several phenotypic characteristics. The polyphasic data presented in this study indicated that these isolates should be recognized as two separate novel species in a novel genus within the family Flavobacteriaceae. The name Sejongia gen. nov. is therefore proposed for the Antarctic isolates, with the type species Sejongia antarctica sp. nov. (type strain AT1013T=IMSNU 14040T=KCTC 12225T=JCM 12381T) and Sejongia jeonii sp. nov. (type strain AT1047T=IMSNU 14049T=KCTC 12226T=JCM 12382T).