Figure 4. Pathogenicity test of Xanthomonas oryzae pv. oryzae and Xanthomonas oryzae pv. oryzicola strains on rice.
(A) Representative result of lesion length symptom tests on the leaves of adult susceptible rice (cultivar 9311, two-month old) after treatment with 50 μg/ml difficidin and bacilysin, respectively. (B) Representative result of water-soaking lesion length tests on rice seedling leaves (cultivar 9311, two-week old) after infiltration with 50 μg/ml difficidin and bacilysin, respectively. (C) Calculated lesion lengths on the leaves of susceptible adult rice. (D) Calculated water-soaking lesion lengths on the leaves of rice seedlings. (E) The number of Xanthomonas cells in adult-susceptible rice leaves and rice seedling leaves after difficidin and bacilysin treatments. Data are expressed as means ± standard deviation (SD); **indicates an extremely significant difference compared with controls (P < 0.01).