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Int J Syst Evol Microbiol 59 (2009), 1997-2001; DOI  10.1099/ijs.0.007997-0
© 2009 International Union of Microbiological Societies

Microvirga guangxiensis sp. nov., a novel alphaproteobacterium from soil, and emended description of the genus Microvirga

Jianli Zhang1, Fei Song1, Yu Hua Xin2, Jun Zhang1 and Caiyuan Fang1

1 School of Life Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China
2 China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China

Correspondence
Jianli Zhang
zhangjianli{at}bit.edu.cn

A Gram-negative-staining bacterium, designated strain 25BT, was isolated from a soil sample from a rice field in Guangxi Province, China, and its taxonomic position was investigated by using a polyphasic approach. Cells were rod-shaped, non-spore-forming, non-motile and strictly aerobic. Strain 25BT grew optimally at 37 °C and pH 7.0. The predominant fatty acids of this soil isolate were C18 : 1{omega}7c, C19 : 0 cyclo {omega}8c and C16 : 0. Phylogenetic analysis based on the almost-complete 16S rRNA gene sequence showed that strain 25BT formed a monophyletic clade with the type strain of Microvirga subterranea; the two organisms shared 97.2 % 16S rRNA gene sequence similarity. However, the two strains shared low DNA–DNA relatedness. Strain 25BT was also readily distinguishable from Microvirga subterranea DSM 14364T by various phenotypic characteristics. The combination of genotypic and phenotypic data suggests that the isolate represents a novel species of the genus Microvirga, for which the name Microvirga guangxiensis sp. nov. is proposed. The type strain is 25BT (=CGMCC 1.7666T=JCM 15710T).

Abbreviations: PHB, poly-β-hydroxybutyrate

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 25BT is EU727176.

A table showing the fatty acid contents of strain 25BT and the type strain of Microvirga subterranea is available as supplementary material with the online version of this paper.






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