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Plasmid transfer of broad-host-range plasmid RP1 from marine Vibrio sp. strain S14 to marine strain SW5 under optimum conditions on the surface of nutrient plates was improved 2 orders of magnitude by using the plasmid transfer process to select an SW5 recipient more efficient than the wild type in receiving and/or maintaining the plasmid. This recipient strain, SW5H, was used to form biofilms under flow conditions on the surfaces of glass beads in reactors. The S142(RP1) donor strain was introduced to the reactors after either 48 or 170 h of biofilm formation, and production of transconjugants in the aqueous phases and biofilms without selection pressure was assessed. Plasmid transfer to the recipient cells in the biofilm was detected for biofilms formed for 170 h but not in those formed for 48 h. The plasmid transfer frequency was significantly higher (P &lt; 0.05) among cells attached to the bead surfaces in the biofilm than among cells in the aqueous phase.

Plasmid Transfer between Marine Bacteria in the Aqueous Phase and Biofilms in Reactor Microcosms