Figure 5.

Protective effect of exogenously applied ethylene and methyl jasmonate on infection by B. cinerea strain MUCL30158 and A. brassicicola. A, Percentage of inoculated leaves showing spreading necrosis symptoms 6 d after inoculation of Arabidopsis wild-type (Col-0) plants with a spore suspension of B. cinerea. Prior to inoculation, separate sets of plants were placed for 48 h in gastight translucent chambers with an atmosphere containing the gaseous compounds as indicated below the bars. Data points represent averages ± se of seven series of inoculations on 16 leaves from two plants. Bars with different letter labels indicate that the corresponding data are significantly different (P > 0.95) according to Tukey's studentized range test (Neter et al., 1996). B, Percentage of inoculated leaves showing spreading necrosis symptoms 6 d after inoculation of Arabidopsis ein2-1 plants with a spore suspension of B. cinerea. Specifications are as in the legend to A. C, Average diameter of lesions formed after 6 d on 4-week-old Arabidopsis pad3-1 mutants inoculated with a spore suspension of A. brassicicola. Prior to inoculation, separate sets of plants were placed for 48 h in gastight translucent chambers with an atmosphere containing the gaseous compounds as indicated below the bars. Data points represent averages ± se of measurements from 40 lesions on 10 different plants. Bars with different letter labels indicate that the corresponding data are significantly different (P > 0.95) according to Tukey's studentized range test (Neter et al., 1996). MeJA, Methyl jasmonate.