Fig. 5.

Expression of rpoS-lacZ in strain DF41 and its derivatives. Strains used were as follows: Pseudomonas sp. strain DF41 (diamonds), DF41 relA mutant (squares), and DF41 relA spoT mutant (triangles). All strains harbored the rpoS-lacZ reporter plasmid pRPOS-lacZ together with empty vector pME6010 (A) or pME-rpoS (B). The results shown in panels A and B are from the same experiment. Note that the presence of pME-rpoS in the SR mutants (B) restored rpoS activity to a level close to that of DF41(pME6010) (A).