FIG. 2.

Effects of high levels of catalase on oxidant killing. X. campestris pv. phaseoli cells harboring pUFR047 (□), pUFRkat (▵) (13), and pUFRoxyR (●) (14) were grown as described in Materials and Methods and treated with the indicated concentrations of oxidants: 40 mM MD plus 20 mM H₂O₂ (A), 15 mM tBOOH plus 20 mM H₂O₂ (B), or 40 mM MD plus 15 mM tBOOH (C). The data shown are means of four independently performed experiments. Error bars indicate the standard error of the mean.