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The transfer of a genetically marked derivative of plasmid RP4, RP4p, fromPseudomonas fluorescens to members of the indigenous microflora of the wheat rhizosphere was studied by using a bacteriophage that specifically lyses the donor strain and a specific eukaryotic marker on the plasmid. Transfer of RP4p to the wheat rhizosphere microflora was observed, and the number of transconjugants detected was approximately 103 transconjugants per g of soil when 107 donor cells per g of soil were added; transfer in the corresponding bulk soil was slightly above the limit of detection. All of the indigenous transconjugants which we analyzed contained a 60-kb plasmid and were able to transfer this plasmid to a Nxr Rpr P. fluorescens recipient strain. The indigenous transconjugants were identified as belonging toPseudomonas spp.,Enterobacter spp.,Comamonas spp., andAlcaligenes spp.

applied and environmental microbiology

Detection of Plasmid Transfer from <i>Pseudomonas fluorescens</i> to Indigenous Bacteria in Soil by Using Bacteriophage φR2f for Donor Counterselection

Detection of Plasmid Transfer from Pseudomonas fluorescens to Indigenous Bacteria in Soil by Using Bacteriophage φR2f for Donor Counterselection