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Published online ahead of print on 19 June 2009 as doi:ijs.0.003871-0
International Journal of Systematic and Evolutionary Microbiology 2009;59:1603.

Int J Syst Evol Microbiol (2009); DOI 10.1099/ijs.0.003871-0
© 2009 International Union of Microbiological Societies
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Serratia nematodiphila sp. nov., symbiotically associated with entomopathogenic nematode Heterorhabditidoides chongmingensis (Rhabditida: Rhabditidae)

Chong-Xing Zhang1, Shou-Yun Yang1, Ming-xu Xu1, Jie Sun1, Huan Liu2, Jing-Rui Liu1, Hui Liu1, Fei Kan1, Jing Sun1, Ren Lai1 and Ke-Yun Zhang1,3

1 College of Life Sciences, Nanjing Agricultural University;
2 Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture

3 E-mail: keyunzhang{at}njau.edu.cn

A novel strain, DZ0503SBS1T, isolated from the intestine of Heterorhabditidoides chongmingensis, was red-pigmented, Gram-negative, motile, fluorescent, rod-shaped, solo lateral flagellum. Comparative 16S rRNA gene sequences analysis indicated that the bacteria is a members of the genus Serratia, sharing higher sequence similarity with the type strain of S. marcescens subsp. sakuensis JCM 11315T (99.8 %), S. marcescens subsp. marcescens DSM 30121T (99.5 %) and S. ureilytica LMG 22860T (98.3 %), respectively. Gene sequences similarity of rpoB with S. marcescens subsp. sakuensis JCM 11315T, S. marcescens subsp. marcescens DSM 30121T and S. ureilytica LMG 22860T are 98 %, 97.4% and 98.3%, respectively. Strain DZ0503SBS1T exhibited 68.2 %, 65.1 %, 53 % similarity to S. marcescens subsp. sakuensis JCM 11315T, S. marcescens subsp. marcescens DSM 30121T and S. ureilytica LMG 22860T by DNA–DNA hybridization, respectively. The major isoprenoid quinone was Q-8 and the predominantly fatty acids were C16 : 0 (34.76 %), cyclo-C17 : 0 (20.03 %), cyclo-C19 : 0 {omega}8c (17.24 %). The content of cyclo-C19 : 0 {omega}8c (17.24 %) is significantly different from S. marcescens subsp. sakuensis JCM 11315T and S. marcescens subsp. marcescens DSM 30121T. The characteristic of fluorescent and symbiotic living with nematodes of the strain DZ0503SBS1T has never been reported in any species of Serratia previously. The phenotypic, biochemical characteristics and molecular data showed that strain DZ0503SBS1T represents a novel species, for which the name Serratia nematodiphila sp. nov. is proposed, the type strain is DZ0503SBS1T (KCTC 22130T = CGMCC 1.6853T).






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