Fig. 4. Analysis of XA21-mediated immune response by Xoo inoculation assay.

TP309 (A) and XA21-TP309 (B) were inoculated by clipping with scissors dipped in the indicated Xoo suspensions at a density of 10⁸ colony forming units (CFU) per mL. Bars indicate the mean lesion length ± standard error (SE) measured 14 days after inoculation (n ≥ 20). The ‘*’ indicates statistically significant difference from PXO99 within each plant genotype using Dunnett’s test (α = 0.01). Experiments were performed at least two times with similar results.