ZmPep1 promotes the production of JA and defense-related metabolites in multiple maize varieties. A, Time course of induced JA in excised leaves supplied with water or ZmPep1. B, Indole measured in excised leaves. C, Anthranilate levels in excised leaves. ZmPep1 was supplied at 2 nmol g−1 fresh weight. Samples were pools of two leaves, n = 3 (±se). For the graphs in A, different letters (a–c) represent significant differences (all ANOVAs, P < 0.001; Tukey test corrections for multiple comparisons, P < 0.05). For the graphs in B, asterisks represent significant differences from the water-treated control (P < 0.05). FW, Fresh weight.