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

A novel bacterium SX-49T 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-49T is a member of the genus Paenibacillus. Values of 16S rRNA gene sequence similarity were highest between SX-49T and P. jamilae DSM 13815T (97.0%), P. brasiliensis DSM 14914T (97.8%), P. polymyxa DSM 36T (97.5%), and P. terrae DSM 15891T (98.8%). The similarity between SX-49T and other Paenibacillus species was < 97.0%. DNA-DNA hybridization values between strain SX-49T and the four type strains were P. jamilae DSM 13815T : 40.6%, P. brasiliensis DSM 14914T : 27.9%, P. polymyxa DSM 36T : 29.2%, and P. terrae DSM 15891T : 66.4%. The DNA G+C content of SX-49T was 46.4 mol%. The predominant fatty acids were anteiso-C15:0 , C16:0 and iso-C16:0 . 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-49T represents a novel species of the genus Paenibacillus, and the name Paenibacillus maysiensis sp. nov. is proposed.