Table 1.

The effect of mutations in the esaI/esaR locus on AHL production, EPS synthesis, and pathogenicity

Strain	esaI/esaR*	AHL synthesis	EPS† production	Pathogenicity‡
DC283	+ +	+	+	4.0
ESN51	− +	−	−	0.1
ESΔR	+ −	+	+++	1.1
ESΔIR	− −	−	+++	2.6

^*+ indicates that the strain contains a wild-type allele of esaI/esaR; − indicates a mutated allele. 

^†The strain produces wild-type, cell density-dependent levels of EPS (+), no EPS; (−); and constitutive, supermucoid levels of EPS (+++) (see Figs. 2 and 5). 

^‡Symptoms on sweet corn seedlings were rated at 10 days on a five-point scale as described in the text.