Characterization of plant beneficial Burkholderia spp

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Previous research using a PhyloChip-based metagenomics analysis of the rhizosphere microbiome of sugar beet revealed that Burkholderia bacteria are part of a consortium associated with soil suppressiveness against the plant pathogen Rhizoctonia solani. To obtain insights into the possible role of these bacteria in this suppressiveness, Burkholderia isolates were obtained from the rhizhosphere of sugar beet. Isolates were identified and characterized genotypically, based on 16S rDNA, lepA and recA genes and BOX-PCR profiles, and phenotypically, by enzymatic and in vitro/vivo activities against R. solani and other plant pathogens. The results obtained in this work suggests that Burkholderia isolates belonging to the species graminis, terricola, hospita, pyrrocinia and caledonica could play a role in the natural suppression of the plant pathogen R. solani.

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