Table 1. Strains and plasmids used in this study.

Strain or plasmid	Description*	Source and reference
Strains
PAO1	Prototrophic PAO1	S. E. H. West, University of Wisconsin (West et al., 1994)
C6	PAO1 parent strain; Δanr, Fur mutation is Ala-10-Gly	M. L. Vasil, University of Colorado Denver (Barton et al., 1996)
PAO6261	PAO1 parent strain; Δanr	M. L. Vasil (Barton et al., 1996)
PAO1 : : pvdS	PAO1 with 460 bp pvdS internal deletion, Gmr	I. Lamont, University of Otago, New Zealand (Cunliffe et al., 1995)
PW6979 : : bfrB-lacZ	bfrB-C04 : : ISlacZ/hah, Tcr	University of Washington Genome Center (Jacobs et al., 2003)
Plasmids
pRL88	pSW205 carrying a regA–lacZ fusion, Cbr	D. Storey, University of Calgary, Canada (Storey et al., 1990)
pMP220 : : PpvdA	pMP220 carrying a pvdA promoter transcriptional lacZ fusion, Tcr	P. Visca, University ‘Roma Tre’, Italy (Ambrosi et al., 2002)
pMP220 : : PpvdS	pMP220 carrying a pvdS promoter transcriptional lacZ fusion, Tcr	P. Visca (Ambrosi et al., 2002)
pDH10	pMP190 carrying a pchR–lacZ fusion, Smr Cmr	K. Poole, Queen’s University, Canada (Heinrichs & Poole, 1996)

^*Cb, carbenicillin; Cm, chloramphenicol; Gm, gentamicin; Sm, streptomycin; Tc, tetracycline; ^r, resistant.