Figure 1.

Expression profile of the hrpG promoter during bacterial co-culture with Arabidopsis cells. The wild-type R. solanacearum strain GMI1000 (wt, solid line) or its prhA-defficient derivative (prhA::Ω, dashed line) carrying the PhrpG::LuxCDABE fusion were grown in Gamborg medium in the presence of plant cells and luminescence measured at different time points. A representative result using three biological replicates is shown. Promoter output is presented as relative luminescence units (R.L.U) produced by the lux reporter corrected by cell density estimated by OD₆₀₀. Error bars indicate standard deviations.