Zealexins inhibit fungal growth at physiologically relevant concentrations. Average (n = 8, ±sem). A, Zealexin A1. D, Zealexin A2. G, Zealexin A3 influence on the time course of R. microsporus growth in nutrient broth at 0 (▿), 25 (gray triangle), and 100 (▾) μg mL−1. B, Zealexin A1. E, Zealexin A2. H, Zealexin A3 influence on the time course of A. flavus growth in nutrient broth at 0 (△), 25 (gray triangle), and 100 (▲) μg mL−1. C, Zealexin A1. F, Zealexin A2. I, Zealexin A3 influence on the time course of F. graminearum growth in nutrient broth at 0 (□), 25 (gray square), and 100 (▪) μg mL−1. Within plots, different letters (a–c) represent significant differences (all ANOVAs P < 0.006; Tukey test corrections for multiple comparisons: P < 0.05). Not statistically different (NSD) indicates ANOVA P > 0.05.