TABLE 1.

P. fluorescens strains and plasmids

Strain or plasmid	Description	Reference
Strains of P. fluorescens
CHA0	Wild type	27
CHA19	ΔgacS	29
CHA89	gacA::Kmr	11
CHA803	aprD::Tn5	20
CHA805	aprA::′lacZ	This study
CHA806	ΔgacS aprA::′lacZ	This study
Plasmids
pME3087	Suicide vector; ColE1 replicon, IncP-1-Mob, Tcr	27
pME6063	5.0-kb aprA′-′lacZ-′aprA fragment inserted into pME3087, suicide plasmid for aprA::′lacZ chromosomal fusions	This study