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Int J Syst Evol Microbiol 59 (2009), 1173-1178; DOI  10.1099/ijs.0.005751-0
© 2009 International Union of Microbiological Societies

Marinobacterium nitratireducens sp. nov. and Marinobacterium sediminicola sp. nov., isolated from marine sediment

Ying-Yi Huo1, Xue-Wei Xu2,3, Yi Cao1, Chun-Sheng Wang2,3, Xu-Fen Zhu1, Aharon Oren4 and Min Wu1

1 College of Life Sciences, Zhejiang University, Hangzhou 310058, PR China
2 Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, PR China
3 Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, PR China
4 Institute of Life Sciences, and the Moshe Shilo Minerva Center for Marine Biogeochemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel

Correspondence
Xue-Wei Xu
xuxw{at}sio.org.cn
Min Wu
wumin{at}zju.edu.cn

Two strains, CN44T and CN47T, isolated from marine sediment of the East China Sea, were characterized by using a polyphasic approach. The isolates were Gram-negative, strictly aerobic, non-spore-forming rods. The chemotaxonomic characteristics of these isolates included the presence of C18 : 1{omega}7c, C16 : 0, iso-C15 : 0 2-OH and/or C16 : 1{omega}7c and C10 : 0 3-OH as the major cellular fatty acids and Q-8 as the predominant ubiquinone. The DNA G+C contents of strains CN44T and CN47T were 62.5 and 56.3 mol%, respectively. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain CN44T was related to members of the genus Marinobacterium. The most closely related described organism was the type strain of Marinobacterium rhizophilum (95.3 % sequence similarity). Strain CN47T showed the highest sequence similarity to the type strain of Marinobacterium stanieri (97.8 %) and <97 % similarity to other type strains of described Marinobacterium species. The level of DNA–DNA relatedness between strain CN47T and M. stanieri DSM 7027T was 46 %. On the basis of phenotypic and genotypic properties, strains CN44T and CN47T represent two novel species within the genus Marinobacterium, for which the names Marinobacterium nitratireducens sp. nov. (type strain, CN44T =CGMCC 1.7286T =JCM 15523T) and Marinobacterium sediminicola sp. nov. (type strain, CN47T =CGMCC 1.7287T =JCM 15524T) are proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains CN44T and CN47T are EU573965 and EU573966, respectively.

A supplementary table showing the major fatty acids of strains CN44T and CN47T is available with the online version of this paper.






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