Table 1.

Expression of the Psp and Pst genes in P. fluorescens SBW25

lacZ fusion	Medium	β-galactosidase (amol 4 MU/min/cell)a
		4 hours	26 hours
psp-'lacZ	PR	0.22 ± 0.03	0.22 ± 0.07
	PL	0.83 ± 0.35 (3.85)	14.47 ± 3.53 (64.72)
pstC-'lacZ	PR	0.1 ± 0.01	0.16 ± 0.02
	PL	0.14 ± 0.02 (1.48)	0.58 ± 0.06 (3.61)

^a Fold of increase for cells grown in PL medium versus PR medium is shown in parenthesis.