FIG 6.

Systemic resistance induced by PeBL1 against infection by TMV-GFP and P. syringae pv. tabaci in N. benthamiana. (A) The numbers and diameters of TMV-GFP lesions (green fluorescent spots) in systemic leaves of protein-treated plants were significantly smaller than in control plants. The GFP images were taken under UV illumination. (a) The upper PeBL1-treated leaves were imaged at 4 days p.i. (b) The upper buffer-treated leaves were imaged at 4 days p.i. (B) Resistance against P. syringae pv. tabaci. The number of CFU per cm² of buffer-treated N. benthamiana was compared with the number of CFU per cm² of PeBL1-treated N. benthamiana. The latter significantly reduced infection by P. syringae pv. tabaci, with an inhibition ratio of 30% at 4 days p.i. The results are mean values from three independent experiments ± SD. The statistical analyses were performed using Student's t test. The asterisks indicate a significant difference between the treated and control samples (***, P < 0.001).