TABLE 2.

Effect of rpoS-rho interaction on proU P1-lac expression^a

Strain	Genotype	β-Galactosidase sp act with the following plasmid and conditions:
		pHYD275 (E. coli P1-lac)			pHYD373 (S. enterica P1-lac)
		No NaCl, 30°C	NaCl, 30°C	No NaCl, 10°C	No NaCl, 30°C	NaCl, 30°C	No NaCl, 10°C
GJ862	rpoS+rho+	63	275	962	4	4	54
GJ863	rpoS+rho	126	322	885	51	69	463
GJ829	rpoS::IS10 rho+	7	14	56	1	2	2
GJ830	rpoS::IS10 rho	157	467	1,360	26	104	849

^aCultures were grown to mid-exponential phase in trimethoprim-supplemented K-tryptone medium without or with 0.3 M NaCl at 30 or 10°C for β-galactosidase assays. Enzyme specific activities are reported in Miller units (22).