Table 1. Plasmids and strains used in this study.

Strains or plasmids	Relevant characteristics	Reference/source
P. fluorescens
MFE01	Air isolate, RifR	[35]
MFE01Δhcp2	MFE01 with early stop codon in hcp2	[35]
MFE01Δhcp2Chcp2	MFE01Δhcp2 with wild type hcp2 gene reintroduced in its original chromosomal location (previously named MFE01Δhcp2.R)	[35]
MFE01Δhcp1	MFE01 with hcp1 disruption	[36]
MFE01Δhcp3	MFE01 with early stop codon in hcp3	This work
MFE01Δhcp3+EV	MFE01Δhcp3 with empty pPSV35	This work
MFE01Δhcp3+hcp3	MFE01Δhcp3 with pPSV35 containing hcp3	This work
MFE01ΔtssC	MFE01 with early stop codon in tssC	[36]
MFE01ΔtssC+tssC	MFE01ΔtssC with pPSV35 containing tssC	[36]
MFE01ΔtssC+EV	MFE01ΔtssC with empty pPSV35	This work
MFN1032	Clinical strain	[50]
MFP05	Skin isolate	[52]
MFP05-gfp	MFP05 with pSMC2.1-gfp	[35]
P. aeruginosa H103	Prototrophic derivative of PAO1	[51]
Agrobacterium tumefaciens NTI	Strain with plasmid pZLR4 carrying traR and a traG::lacZ reporter fusion from pTiC58. ß–galactosidase producer in contact with C6- to C12-N-Acyl-Homoserine-Lactones (AHLs).	[43]
Pectobacterium atrosepticum 6276	Isolate from Solanum tuberosum, C8-AHLs producer	[44]
Pectobacterium atrosepticum 6276 ΔexpI	Pectobacterium atrosepticum 6276 with mutation of the N-Acyl-Homoserine-Lactones (AHLs) synthetase gene	[45]
Chromobacterium violaceum CV026	Mini-Tn5 mutant of Chromobacterium violaceum. Violacein producer in contact with C4- to C8-AHLs	[42]
E.coli S17.1	RP4-2-Tc::Mu, aph::Tn7, recA, SmR, donor strain for conjugation	[38]
Vectors
pPSV35	P. aeruginosa oriV, lacIq, mob+, PlacUV5, pUC18 MCS, expression vector, GmR	[39]
pSMC2.1-gfp	Replicative plasmid, KmR, gfp	[41]
pAKE604	ApR, KmR, oriT lacZ, sacB	[37]