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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

¹ College of Biological Sciences, China Agricultural University, Beijing 100094, People's Republic of China
² State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, ZhongGuanCun, Haidian, Beijing 100080, People's Republic of China

Correspondence
Shuang-Jiang Liu
liusj{at}sun.im.ac.cn

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.

A transmission electron micrograph of strain HY9^T, two phylogenetic trees and a table of fatty acid compositions are available as supplementary material in IJSEM Online.