FIG. 1.

ISR to P. syringae pv. lachrymans in 14-day-old cucumber leaves at 48 to 120 h post-challenge inoculation, 96 h from application of T. asperellum to the root system. Disease severity is expressed as necrosis diameter (A) or proportion of necrotic area relative to total leaf area (B). Shown are results for noninoculated plants (white columns), plants treated with autoclaved inoculum of T. asperellum (AT) (dotted columns), and plants treated with mycelial inoculum of T. asperellum (T-203) (striped columns). Columns headed by the same letter are not significantly different (α ≤ 0.05, one-way analysis of variance). Error bars represent standard deviations (SD) from results for 20 replicate plants that received the same treatment.