Figure 3

Arabidopsis accessions showing disease severity caused by Ps. syringae pv. tomato DC3000 infection in P. simplicissimum GP17-2-treated and control plants. ISR was induced by treating the roots of 2-week-old plants with CF of P. simplicissimum GP17-2. Pst was sprayed onto leaves until run-off. Disease severity was measured 5 days after challenge inoculation by recording the percentage of total leaf surface showing symptoms for each plant, where 0 = no symptoms; 100 = most severe necrotic symptoms. In individual accession asterisk indicate a statistically significant difference between treatments (Student’s t test, P < 0.05). The data presented are from representative experiments that were repeated three times with similar results.