A pale yellow， ovoid- to rod-shaped and budding bacterium， designated strain M-S13-148(T)， was isolated from a decayed bone of whale from the eastern coast of King George Island， South Shetlands， Antarctica. Strain M-S13-148(T) exhibited motility， aerobic growth and was Gram-stain-negative. Strain M-S13-148(T) was positive for catalase and oxidase. Growth was observed at pH 6.0-9.0， at 4-42 °C and with 0-14% (w/v) NaCl. The novel strain contained diphosphatidylglycerol， phosphatidylglycerol， phosphatidylcholine， phosphatidylethanolamine and an unknown phospholipid as the major polar lipids. The dominant cellular fatty acids were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c)， (58.8%) a... More
A pale yellow， ovoid- to rod-shaped and budding bacterium， designated strain M-S13-148(T)， was isolated from a decayed bone of whale from the eastern coast of King George Island， South Shetlands， Antarctica. Strain M-S13-148(T) exhibited motility， aerobic growth and was Gram-stain-negative. Strain M-S13-148(T) was positive for catalase and oxidase. Growth was observed at pH 6.0-9.0， at 4-42 °C and with 0-14% (w/v) NaCl. The novel strain contained diphosphatidylglycerol， phosphatidylglycerol， phosphatidylcholine， phosphatidylethanolamine and an unknown phospholipid as the major polar lipids. The dominant cellular fatty acids were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c)， (58.8%) and C16 : 0 (11.7%). The respiratory quinone was Q-10 and the DNA G + C content was 60.9 mol%. Neighbour-joining， maximum-likelihood and minimum-evolution phylogenetic trees， based on 16S rRNA gene sequences， indicated that strain M-S13-148(T) belonged to the genus Roseovarius and was most closely related to Roseovarius nanhaiticus CCTCC AB 208317(T) (93.72% 16S rRNA gene sequence similarity). The 16S rRNA gene sequence similarity with respect to members of the genus Roseovarius ranged from 91.81 to 93.94%. On the basis of phenotypic， molecular and chemotaxonomic characteristics， strain M-S13-148 is considered to represent a novel species of the genus Roseovarius， for which the name Roseovarius antarcticus sp. nov.， is proposed. The type strain is M-S13-148(T) ( = CCTCC AB2014072(T) = LMG 28420(T)).
