Figure 4.

The ycgZ‐ymgABC promoter marbox is required for maximal activity in vivo during exponential growth and in the presence of salicylic acid.

A. The graphs show levels of β‐galactosidase activity measured in lysates of E. coli strain JCB387 carrying different ycgZ::lacZ fusions in plasmid pRW50. Cultures in M9 minimal media were grown to exponential phase or stationary phase as indicated. The value of P was calculated using a two‐tailed student's t‐test.

B. Levels of β‐galactosidase activity measured in lysates of cells grown in the presence of 5 mM sodium salicylate. The value of P was calculated using a two‐tailed student's t‐test. [Colour figure can be viewed at https://www.wileyonlinelibrary.com]