FIG. 1.

P. aeruginosa PA14 and B. vietnamiensis G4 were tested for their ability to induce either P. aeruginosa PAO1 (lasI rhlI) quorum-sensing-controlled fusions (qsc131 and qsc132A) (A) or P. aeruginosa PA14 Tn5lacZ fusions (B). ND indicates that the transposon insertion site of the fusion was not determined. B. vietnamiensis and P. aeruginosa PA14 strains were incubated on LB-X-Gal plates for 24 h at 30°C prior to inoculation of the fusion strains. Plates were photographed after 40 h of coincubation at 30°C.