ScholarWorks@중앙대학교

초록

Two novel bacterial strains, designated CJ20T and CJ99T, belonging to the genus Sphingomonas,were isolated from the Han River in South Korea and a wetland in South Korea, respectively. Cells of both strains were Gram-stain-negative, aerobic, non-motile and yellow-pigmented. Strains were shown to grow optimally at 30˚C and pH 7 in the absence ofNaCl on tryptic soy medium. Phylogenetic analysis based on 16S rRNA gene sequencesshowed that strains CJ20T and CJ99T belonged to the genus Sphingomonas and were mostclosely related to S. asaccharolytica Y-345T and Sphingomonas koreensis JSS26T with97.87% and 97.58% 16S rRNA gene sequence similarities, respectively. Average nucleotideidentity and digital DNA-DNA hybridization values of strain CJ20T with S. asaccharolyticaY-345T were 74.1% and 15.9%, respectively and those values of strain CJ99T with S. koreensisJSS26T were 73.9% and 15.6%, respectively. Both strains contained ubiquinone (Q-10) as thepredominant respiratory quinone. The major polar lipids of strains CJ20T and CJ99T comprisedphosphatidylethanolamine, diphosphatidylglycerol, phosphatidylglycerol, and sphingoglycolipid. The predominant fatty acids of both strains were summed feature 8 (C18:1 ω7cand/or C18:1 ω6c) and C16:0. Based on polyphasic taxonomic analyses, strains CJ20T and CJ99Trepresent novel species of the genus Sphingomonas, for which names Sphingomonas degradanssp. nov. and Sphingomonas paludis are proposed, respectively. The type strainsare CJ20T (= KACC 23909 = JCM 37720) and CJ99T (= KACC 24077 = JCM 37956).

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