Fig. 1

Deletion of hpa1 and pthXo1 genes reduces virulence of Xoo strain PXO99 on the susceptible rice variety Nipponbare. Deletion of hpa1 and pthXo1 genes reduces virulence of Xoo strain PXO99 on the susceptible rice variety Nipponbare. a Bacterial blight symptoms on leaves photographed at day 12 after leaf-top-clipping inoculations. b Blight lesion length on leaves from (a). c Bacterial populations shown as colony formation unit (cfu) of cultures of bacteria recovered from leaves 3 days after leaf-center-infiltrating inoculations. In (b) and (c), quantitative data are given as mean values ± statistical estimates of standard error of mean (SEM). Different letters on bar graphs indicate significant differences in multiple comparisons of data from the different bacterial strains; P < 0.05; n = 30 leaves from 3 independent experiments each involving 10 leaves in B; n = 9 repetitions from 3 independent experiments each involving 3 repetitions in (c)