Fig. 1.

Responsiveness of SqrR-regulated genes to sulfide and polysulfides. Temporal changes in the relative transcript level of the rcc01557 gene assayed by qRT-PCR after treatment with sulfide (t = 0 min) in WT (white bars) and Δsqr (red bars) strains. Cells were grown to the mid-log phase under aerobic conditions, and 0.2 mM sodium sulfide was added at t = 0. Data shown are mean ± SE from three biological replicates (error bars). Means followed by different letters are significantly different (Tukey test, P > 0.05).