A role for the NPR1 paralogs in resistance triggered by MeJA. Double mutants of npr1-70 with NPR1 paralogs and their corresponding controls were tested for resistance triggered by MeJA as described in Figure 1. (a) Double mutants with npr2. (b) npr3. (c) npr4. (d) bop1 and bop2. Four independent lines were tested in each case, except with bop1, where only two were obtained. One asterisk means a significant difference with P<0.05, and two asterisks means P<0.01 (Student’s test of one tail).