FIG. 6.
ohr and ohrR promoter deletion analyses. (A) Map of the ohr-ohrR intergenic region showing the upstream end points of promoter fragments used to construct the various promoter-lacZ fusion plasmids; (B) β-galactosidase activity of A. tumefaciens harboring the ohr promoter-lacZ fusion pPohr or its deletions p921 and p1236; (C) β-galactosidase activity of A. tumefaciens harboring pPohrR or its deletions. p975/pOhrR represents A. tumefaciens containing p975 and carrying pOhrR for the expression of ohrR. Cells were cultured to exponential phase before induction with tBOOH (░⃞), CuOOH (▪), or uninduced (□). Values are the means and SD from four replicate experiments.