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Int J Syst Evol Microbiol. 2006 Dec;56(Pt 12):2927-30.

Cyclobacterium lianum sp. nov., a marine bacterium isolated from sediment of an oilfield in the South China Sea, and emended description of the genus Cyclobacterium.

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  • 1College of Biological Sciences, China Agricultural University, Beijing 100094, People's Republic of China.


The marine bacterial strain HY9(T) was isolated from sediment from the South China Sea. Strain HY9(T) is aerobic, heterotrophic and rose-pigmented. The cells are non-motile and curved, i.e. ring-like or horseshoe-shaped. The 16S rRNA gene sequence of strain HY9(T) was determined and blast searches revealed that it possessed significant sequence similarities with respect to Cyclobacterium species (92.8-93.6 %). Phylogenetic analysis confirmed that strain HY9(T) was tightly clustered with members of the genus Cyclobacterium. The cellular morphology and chemotaxonomic and phenotypic properties of strain HY9(T) showed that it should be classified as a member of the genus Cyclobacterium. Significant evolutionary distances and a range of phenotypic features distinguished strain HY9(T) from previously described Cyclobacterium species. Hence, strain HY9(T) represents a novel species in the genus Cyclobacterium, for which the name Cyclobacterium lianum sp. nov. is proposed. The type strain is HY9(T) (=CGMCC 1.6102(T)=JCM 14011(T)). On the basis of this study and previously described properties of Cyclobacterium species, an emended description of the genus Cyclobacterium is proposed.

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