TABLE 4.

Role of the rcsA, dsrA, and rcsB genes in λ induction^a

Plasmid and gene(s)	Concn (cells/ml) at t1	Frequency of infective centers (λc+) at t1	Concn of phage (λc+/ml) at:
			t1	t2	t3
B7252(λ) (rcsA recA)
No plasmid	2.5 × 108	2.9 × 10−7	70	40	40
pDR211 (rcsA::ΔTn903)	1.7 × 108	1.4 × 10−7	70	60	20
pDR311 (dsrA::ΔTn903)	1.3 × 108	8.0 × 10−8	70	60	30
pDR210 (rcsA+)	1.3 × 108	1.5 × 10−6	5.0 × 102	4.0 × 102	2.0 × 102
pDR311 (dsrA+)	9.0 × 107	1.2 × 10−5	2.0 × 102	1.5 × 103	4.0 × 103
B7307(λ) (dsrA recA)
No plasmid	1.0 × 108	1.1 × 10−7	10	20	1.0 × 102
pDR211 (rcsA::ΔTn903)	9.0 × 107	3.0 × 10−7	30	30	60
pDR311 (dsrA::ΔTn903)	9.0 × 107	4.7 × 10−7	50	60	1.5 × 102
pDR210 (rcsA+)	1.2 × 108	9.1 × 10−7	8.0 × 102	9.0 × 102	3.0 × 102
pDR311 (dsrA+)	1.1 × 108	8.9 × 10−6	8.0 × 102	1.1 × 103	3.7 × 103
B7253(λ) (rcsB recA)
No plasmid	2.5 × 108	2.3 × 10−7	20	50	30
pDR211 (rcsA::ΔTn903)	1.0 × 108	1.0 × 10−7	10	30	20
pDR311 (dsrA::ΔTn903)	9.0 × 107	1.6 × 10−7	10	40	20
pDR210 (rcsA+)	1.2 × 108	1.9 × 10−7	20	40	10
pDR311 (dsrA+)	1.4 × 108	5.9 × 10−6	4.0 × 102	1.0 × 103	4.0 × 103

^aExperimental methods and conditions were as described in footnote a of Table 3. Data presented are as described in footnote a of Table 3.