Non-diazotrophic Bradyrhizobium spp. genome sequencing and assembly. Bradyrhizobium

This study provides evidence that both diazotrophic and non-diazotrophic Bradyrhizobium spp. colonize the root endophytic compartment of a wide variety of plant species, including the model species Arabidopsis thaliana. This suggests that plant roots form a major ecological niche of Bradyrhizobium spp., which might be ancestral to the evolution of the nodulation and nitrogen-fixation trait in this genus.