TABLE 4.

Induction of the put promoters in the presence of corn root exudates^a

Fusion	Incubation conditions	β-Galactosidase activity
PputA::′lacZ	Corn exudate	425 ± 50
	M8	20 ± 10
PputP::′lacZ	Corn exudate	270 ± 50
	M8	60 ± 10

^aP. putida KT2442 cells bearing pMIS5 (P_putA::′lacZ) or pMIS12 (P_putP::′lacZ) grown on M9 minimal medium with succinate were harvested and suspended in M8 minimal medium (M8) or in the same medium enriched for 7 days with corn root exudates (corn exudate) and incubated at room temperature without agitation. β-Galactosidase activity was determined as described in the footnote to Table 3.