Fig 4. Effect of Fur on synthesis of AHLs in Pcb1692Δfur mutant relative to the Pcb1692 wild type strain.

Production of AHLs was indicated by formation of blue color ring 48 hours after each strain was co-inoculated with CV026 reporter strain at 28°C. (A) Pcb1692 wild-type strain (B) Pcb1692Δfur mutant (C) Pcb1692Δfur-pfur complemented mutant strain and (D) Pcb1692ΔexpI mutant strain.