TABLE 2.

Proline uptake and inducing effects in S. meliloti strains

Strain	Uptake (mean ± SE)		luxAB induction (RLU/OD unit/min) (mean ± SE)b
	Rate (nmol of proline/min/mg)a	Decrease (%)	− Proline	+ Proline
Rm1021	27 ± 1	0	NAc	NA
Rm1021-S10	16 ± 4	41	3,070 ± 584	1,390 ± 446
Rm1021-S11	6 ± 1	78	2,490 ± 40	26,500 ± 3,180

^aUptake measured with 10 μM [¹⁴C]proline. 

^bMaximum response observed during a 6-h induction test with 10 or 100 μM proline for Rm1021-S10 and Rm1021-S11, respectively. 

^cNA, not applicable.