FIG. 1.

Plating efficiency of an oxyR mutant harboring various expression plasmids containing genes involved in oxidative stress response or conditions that affected oxidative stress. In all experiments, a mid-log-phase X. campestris pv. phaseoli oxyR mutant grown in SB was serially diluted and plated on SB plates with or without 10 mM pyruvate. Plating efficiency is defined as the number of cells on SB plates divided by the number of cells on SB plates with pyruvate. Pyr, X. campestris pv. phaseoli oxyR mutant on 10 mM pyruvate SB plates; Mic, the mutant was plated on SB plates and incubated in an anaerobic jar under microaerobic conditions (Oxoid gas generating kit); UFR, X. campestris pv. phaseoli oxyR mutant harboring only pUFR047 (4) expression vector; C, pahpC (15); F, pahpF (ahpF subunit of X. campestris pv. phaseoli [15] in pUFR047); CF, pahpCF (ahpC and ahpF [15] in pUFR047); Kat, pkat (21); Sod, psod (Xanthomonas sod [28] coding region in pUFR047).