Fig. 6

a Levels of rpoE mRNA as determined by real time RT PCR in wild type 2.4.1 (white bars), phyR mutant (black bars) and complemented strain (grey bars). The fold change of 7 min versus 0 min under t-BOOH after normalization to rpoZ mRNA level is shown. b Levels of relative expression are shown for catA in response to hydrogen peroxide and gloA, gloB in response to ¹O₂ exposure in wild type 2.4.1 (white bars), phyR mutant (black bars) and complemented strain (grey bars). Exposure to hydrogen peroxide or ¹O₂ was performed for 7 min. Values for relative expression levels represent the increase in gene expression compared to that of the control at time point 0 min and were normalized to mRNA levels determined for rpoZ. The mean of three experiments with standard deviation is shown. c Relative rpoE mRNA levels under different stress conditions as determined by real time RT PCR in the wild type and the mutant lacking PhyR. * indicate a significant change (P ≤ 0.05), ** indicate a highly significant change (P ≤ 0.01) according to Students t-test