Heat-killing curves for P. syringae pv. syringae FF5(pPSR12) (wild-type [⧫]) and FF5.LK1 (algT mutant [■]). The strains were incubated at 43°C for 15, 30, 45, and 60 min, and surviving cells were counted as CFU. Bars indicate standard errors of the means, and survival is expressed as the percentage of input CFU at time zero. The experiment was repeated with similar results.