Figure4. Silencing of OsSerk1 does not affect XA21-mediated immunity to Xoo.

(A) Disease lesion lengths of Xa21 Kitaake, Kitaake, Xa21kit-OsSerk1Ri #1602 and #1603 plants at 20 DAI. Lines #1602 and #1603, derived from independent T₀ plants Ri1(A-1) and Ri4(A-4), respectively, are homozygous for the transgene OsSerk1Ri. All plants were inoculated at six weeks old in the field. Lesion lengths were measured at 20 DAI for 10 independent plants. The photograph depicts representative symptom development in leaves at 20 DAI. (B) Bacterial populations of Xa21 Kitaake, Kitaake, Xa21kit-OsSerk2Ri #A814, Xa21kit-OsSerk1Ri #1602 and #1603 lines at 0, 10 and 20 DAI. Each data point represents the average ± SD of 6 leaves from 3 independent plants. Statistical significance comparison was conducted with ANOVA, where the different capital letters above the columns and around the point indicate differences with $\mathrm{P}\leqq 0.01$.