FIG 2.

Inhibition of Fusarium spp. by P. protegens Pf-5 and derivative strains on PDA amended with 10⁻⁴ M FeCl₃. Pf-5 and derivatives having deletions in specified genes are shown on the x axis. The percent inhibition of F. verticillioides isolate T4-0 (white bars), F. oxysporum f. sp. pisi race 2 isolate R2-238 (gray bars), and F. oxysporum f. sp. pisi race 5 isolate R5 (black bars) was determined as shown in Fig. 1. Cultures were grown for 5 days at 27°C before radial growth of Fusarium spp. was measured. Means represent four replicate plates, and error bars represent the standard error of the mean.