FIGURE 1.

The b3-17 mutant impairs RPW8.1-mediated defense against powdery mildew. (A) Representative 6-week-old plants of the indicated lines show the difference in plant size. Note the freshly emerged light-green leaf (arrowhead) in the b3-17 mutant in comparison with the green ones (arrows) in R1Y4 and Col-gl. (B) Representative leaves from the indicated lines show the disease phenotype of powdery mildew at 10 days post inoculation (dpi). (C) Quantitative assay for the powdery mildew sporulation at 10 dpi. The number of spores was counted from 30 mg infected leaves for statistical analysis. Error bars represent standard deviation (SD, n = 6). Different letters above the bars indicate significant differences at P < 0.01. Similar results were obtained in three independent experiments.