Abstract
Three Gram-negative bacterial strains, DQW12E6-69-1(T), DQW12E61-22-1, and DQW12E6-22-1-1, were isolated from an oil production mixture from Daqing Oilfield, northeastern China. The phylogenetic analysis based on the 16S rRNA gene sequences revealed that the three strains formed a stable cluster different from the known genus in Rhodobacteraceae of Alphaproteobacteria. In addition, they were most closely related to species in genera Pararhodobacter, Rhodobacter ,and Rhodobaca with the 16S rRNA gene sequence similarities being 95.1-95.9 %. Cells of the three strains were aerobic; they do not require salt to grow but are resistant to high salinity. They could conduct chemoorganoheterotrophic growth on various carbon sources, with non-phototrophic growth observed. The genomic DNA G+C contents of the strains DQW12E6-69-1(T), DQW12E6-22-1-1, and DQW12E61-22-1 were 63.8, 63.7, and 63.6 mol%, respectively. The predominant respiratory ubiquinone of DQW12E6-69-1(T) was Q-10, and the major fatty acids were C18:1 ω7c, C(18:0), and C(10:0) 3-OH. Photosynthetic pigments and photosynthetic reaction center gene pufM were not detected. The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, unidentified glycolipid, and unidentified phospholipid. On the basis of phenotypic, genotypic, and chemotaxonomic characteristics, strains DQW12E6-69-1(T), DQW12E61-22-1, and DQW12E6-22-1-1 represent a novel genus and a novel species of the family Rhodobacteraceae. The name Halodurantibacterium flavum gen. nov., sp. nov. is proposed with strain DQW12E6-69-1(T) (=LMG 27742(T) = CGMCC 1.12756(T)) as the type strain.
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