FIG 6.
Transcript abundance of phnJ in isolates grown with phosphate, MPn, or both. Liquid subsamples (1.5 or 3.0 ml) were removed from all cultures during mid-exponential and stationary phases of growth on each P source (MPn, K2HPO4, or both). Transcript levels were calculated relative to phnJ in cells grown with phosphate and harvested during the exponential growth phase. Expression of phnJ was highest in cells grown with MPn as the sole P source; in strains LM-1, LM-5, and LM6-1, expression was lower but still detectable when both MPn and phosphate were supplied as P sources. Expression of phnJ in LM-Y in the presence of both MPn and phosphate is indistinguishable from its expression in the presence of phosphate only.