Characterization of snc4-1D opr3-2 double mutants. A, Morphology of wild-type (WT), snc4-1D, opr3-2, and snc4-1D opr3-2 mutant plants. Plants were grown on soil and photographed when they were 3 weeks old. B to D, Expression of PDF1.2 (B), PR1 (C), and PR2 (D) in wild-type, snc4-1D, opr3-2, and snc4-1D opr3-2 mutant seedlings. Error bars represent sd from averages of three measurements. Values were normalized to the expression of ACTIN1. E, Growth of H. a. Noco2 on wild-type, snc4-1D, opr3-2, and snc4-1D opr3-2 double mutant plants. Infection was performed and scored as in Figure 1B. The values presented are averages of three replicates ± sd. [See online article for color version of this figure.]