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

¹ School of Biological Sciences, Seoul National University, 56-1 Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea
² Polar Research Institute, Korea Ocean Research and Development Institute, Ansan PO Box 29, Seoul 425-600, Republic of Korea

Correspondence
Jongsik Chun
jchun{at}snu.ac.kr

Two yellow-pigmented, Gram-negative and aerobic bacterial strains, designated AT1013^T and AT1047^T, 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 °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 9c. 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 AT1013^T=IMSNU 14040^T=KCTC 12225^T=JCM 12381^T) and Sejongia jeonii sp. nov. (type strain AT1047^T=IMSNU 14049^T=KCTC 12226^T=JCM 12382^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains AT1013^T and AT1047^T are AY553293 and AY553294.

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