Phenotypic studies, as well as the reaction of genomic DNA with a 16S ribosomal DNA (sequence of variable regions V1 to V4)-based -specific PCR system and oligonucleotide probe, the presence of sequences homologous to in both and , and the results of DNA-DNA hybridization experiments performed with the and type strains and one additional strain, showed that these two species form a homogeneous group. In addition, evidence was found for the presence of genes in , and was shown to fix atmospheric nitrogen. Therefore, the names and should be considered synonyms. As was capable of fixing nitrogen and fixation without inhibition by nitrate is a major characteristic of the group, we propose that be included in the species


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