FIG. 5.

Minimum effective concentration of 2,4-diacetylphloroglucinol for repression of pyoluteorin production in Pf-5. Pyoluteorin concentrations (a) and CFU (b) were measured in Pf-5 after culturing for 18 h in NBGly that was amended with the concentrations of 2,4-diacetylphloroglucinol indicated on the abscissa. 2,4-Diacetylphloroglucinol amendments did not significantly alter population sizes. Differing letters above symbols denote treatments significantly different from one another (P ≤ 0.05; two-sample t test). Error bars denote one standard error.