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Int J Syst Evol Microbiol 59 (2009), 2656-2661; DOI  10.1099/ijs.0.009308-0
© 2009 International Union of Microbiological Societies

Paenibacillus sonchi sp. nov., a nitrogen-fixing species isolated from the rhizosphere of Sonchus oleraceus

Yuan-Yuan Hong1, Yu-Chao Ma1, Yu-Guang Zhou2, Fei Gao3, Hong-Can Liu2 and San-Feng Chen1

1 The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, PR China
2 China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing 100101, PR China
3 College of Biological Sciences, China Agricultural University, Beijing 100094, PR China

Correspondence
San-feng Chen
chensf{at}cau.edu.cn

A nitrogen-fixing bacterium, designated strain X19-5T, was isolated from rhizosphere soil of Sonchus oleraceus. Phylogenetic analysis based on a fragment of the nifH gene and the full-length 16S rRNA gene sequence revealed that strain X19-5T was a member of the genus Paenibacillus. Strain X19-5T showed the highest 16S rRNA gene sequence similarity (98.8 %) with Paenibacillus graminis RSA19T and below 97 % similarity with other recognized members of the genus. The level of DNA–DNA relatedness between strain X19-5T and P. graminis RSA19T was 45.7 %. The DNA G+C content of strain X19-5T was 46.8 mol%. The major fatty acids were anteiso-C15 : 0, C16 : 0 and iso-C16 : 0. On the basis of its phenotypic characteristics and the level of DNA–DNA hybridization, strain X19-5T is considered to represent a novel species of the genus Paenibacillus, for which the name Paenibacillus sonchi sp. nov. is proposed. The type strain is X19-5T (=CCBAU 83901T=LMG 24727T).

The GenBank/EMBL/DDBJ accession numbers for the nifH and 16S rRNA gene sequences of strain X19-5T are EU867444 and DQ358736, respectively.

An extended neighbour-joining phylogenetic tree of representatives of the genus Paenibacillus based on 16S rRNA gene sequences is available as supplementary material with the online version of this paper.






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