Figure 2.

Sensitivity of Edwardsiella piscicida to oxidative stress, iron deficiency, and acid stress. TX01, TX01∆trxH, and TX01∆trxHC were cultured in LB medium and LB agar plates with pH = 7 (normal A), with pH = 5 (B), with 80 μM 2,2′dipyridyl (Dp, C), or with 1 mM H₂O₂ (D) at 28 °C for 24–48 h. The populations of cultivated bacteria were counted by diluted plate. E TX01 and TX01∆trxH were cultured to early logarithmic phase in normal LB medium, then 5 mM H₂O₂ were added to the medium, and cell density was measured at different time points by determining absorbance at OD₆₀₀. Data are the means of three independent experiments and presented as mean ± SEM (N = 3). N, the number of times the experiment was performed. *P < 0.05, **P < 0.01.