FIG. 3.

Adaptive and cross-protective responses against peroxide killing in X. campestris pv. phaseoli and an X. campestris pv. phaseoli oxyR mutant. Log-phase uninduced X. campestris pv. phaseoli (○) and an X. campestris pv. phaseoli oxyR mutant (▵) and oxidant-induced (30-min treatment with either 100 μM H₂O₂ [A] or 50 μM MD [B and C]) X. campestris pv. phaseoli (•) and X. campestris pv. phaseoli oxyR mutant (▴) grown in SB were treated with killing concentrations of either 30 mM H₂O₂ (A and B) or 100 mM tBOOH (C) as previously described (15). At the indicated times, aliquots of cells were removed and washed twice before viable cells were counted (23). Experiments were repeated three times, and representative results are shown.