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Members of the genus  Burkholderia  (β-proteobacteria) have only recently been shown to be able to establish a nitrogen-fixing symbiosis with several legumes, which is why they are also referred to as β-rhizobia. Therefore, very little is known about the competitiveness of these species to nodulate different legume host plants. In this study, we tested the competitiveness of several  Burkholderia  type strains ( B. diazotrophica ,  B. mimosarum ,  B. phymatum ,  B. sabiae ,  B. symbiotica  and  B. tuberum ) to nodulate four legumes ( Phaseolus vulgaris ,  Macroptilium atropurpureum ,  Vigna unguiculata  and  Mimosa pudica ) under our closely defined growth conditions. The assessment of nodule occupancy of these species on different legume host plants revealed that  B. phymatum  was the most competitive strain in the three papilionoid legumes (bean, cowpea and siratro), while  B. mimosarum  outcompeted the other strains in mimosa. The analysis of phenotypes known to play a role in nodulation competitiveness (motility, exopolysaccharide production) and additional  in vitro  competition assays among β-rhizobial strains suggested that  B. phymatum  has the potential to be a very competitive legume symbiont.

Competition Experiments for Legume Infection Identify Burkholderia phymatum as a Highly Competitive β-Rhizobium