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

¹ China Agricultural University;
² China General Microbiological Culture Collection Center

^* Corresponding author; email: 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 similarity (98.8%) with Paenibacillus graminis RSA19T and below 97% similarity with other recognized members of the genus in 16S rRNA gene sequence. 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 46.83 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 sonchus sp. nov. is proposed. The type strain is X19-5T (=CCBAU83901= LMG24727).