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Flavobacterium cauense sp. nov., isolated from sediment of a eutrophic lake

¹ State Key Lab for Agrobiotechnology, Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100193, PR China
² College of Bioengineering, Henan University of Technology, Zhengzhou 450000, PR China

Correspondence
Hong-Li Yuan
hlyuan{at}cau.edu.cn

A Gram-negative, rod-shaped, yellow-pigmented bacterium, designated strain R2A-7^T, was isolated from sediment of the eutrophic Taihu Lake in Jiangsu Province, China. The isolate was subjected to a taxonomic study using a polyphasic approach. Phylogenetic analysis based on the 16S rRNA gene sequences placed strain R2A-7^T within the genus Flavobacterium in the family Flavobacteriaceae. The highest sequence similarity was found with Flavobacterium saliperosum (98.3 %), followed by other Flavobacterium species with similarities <96.0 %. The major fatty acids (>5 %) were 15 : 0 iso, 17 : 1 iso 9c, 17 : 0 iso 3-OH, 15 : 1 iso G and 15 : 0 iso 3-OH. The G+C content of the genomic DNA of strain R2A-7^T was 37.7 mol%. The DNA–DNA relatedness value with F. saliperosum CGMCC 1.3801^T was 40.6 %. Molecular and phenotypic data suggest that strain R2A-7^T represents a novel species within the genus Flavobacterium, for which the name Flavobacterium cauense is proposed. The type strain is R2A-7^T (=CGMCC 1.7270^T=NBRC 104929^T).

Maximum-parsimony and minimum-evolution phylogenetic trees based on 16S rRNA gene sequences are available as supplementary material with the online version of this paper.