FIG. 2.

Growth of isolate PMY1 on phosphonomycin (5 mM) as the sole carbon, energy, and phosphorus source. Cultures were incubated at 30°C on an orbital shaker at 100 rpm. Growth was measured by the increase in optical density at 650 nm, while phosphate release was determined by the method of Fiske and SubbaRow (4). Symbols: •, growth (optical density at 650 nm); ▪, percentage of phosphate released from substrate.