SrrA is required for resistance to oxidative stress. (A) Strains 11035 (wild type [WT]), TΔsrrA-pyrG7 (ΔsrrA), TΔsskA-riboB8 (ΔsskA), and TΔsrrA-pyrG/ΔsskA-riboB8 (ΔsrrA ΔsskA) were point inoculated onto supplemented MM plates containing either 0.5, 1.0, or 2.0 mM H2O2 or 0.5 mM tb-hprx and were incubated at 37°C for 5 days. (B) The same strains were inoculated as for panel A onto plates containing 60 μM menadione.