Paenibacillus maysiensis sp. nov., a Nitrogen-Fixing Species Isolated from the Rhizosphere Soil of Maize

Abstract

A novel bacterium SX-49^T with nitrogen-fixing capability was isolated from the rhizosphere soil of maize. Phylogenetic analysis of nifH gene fragment and 16S rRNA gene sequence revealed that the strain SX-49^T is a member of the genus Paenibacillus. Values of 16S rRNA gene sequence similarity were highest between SX-49^T and P. jamilae DSM 13815^T (97.0%), P. brasiliensis DSM 14914^T (97.8%), P. polymyxa DSM 36^T (97.5%), and P. terrae DSM 15891^T (98.8%). The similarity between SX-49^T and other Paenibacillus species was < 97.0%. DNA-DNA hybridization values between strain SX-49^T and the four type strains were P. jamilae DSM 13815^T: 40.6%, P. brasiliensis DSM 14914^T: 27.9%, P. polymyxa DSM 36^T: 29.2%, and P. terrae DSM 15891^T: 66.4%. The DNA G+C content of SX-49^T was 46.4 mol%. The predominant fatty acids were anteiso-C_15:0, C_16:0 and iso-C_16:0. The predominant isoprenoid quinone was MK-7. The genome contains 5628 putative protein-coding sequences (CDS), 6 rRNAs and 56 tRNAs. The phenotypic and genotypic characteristics, DNA-DNA relatedness, and genome features suggest that SX-49^T represents a novel species of the genus Paenibacillus, and the name Paenibacillus maysiensis sp. nov. is proposed.