FIGURE 6.

Effect of TKA on the pathogenicity of Xoo on rice. (A) The representative lesion lengths on the leaves of the Xoo-inoculated rice seedlings of cultivar IR24 treated with different concentration of TKA (13.5 μg/mL, 27 μg/mL and 54 μg/mL) in greenhouse for 14 days. At least 50 rice leaves were recorded in each treatment. Each treatment was repeated three times. (B) The lesion lengths on the leaves of the Xoo-inoculated rice seedlings of cultivar IR24 treated with different concentration of TKA (13.5 μg/mL, 27 μg/mL and 54 μg/mL) in greenhouse for 14 days. The graph shows data from triplicate experiments (mean ± S.D.). Asterisk indicates significant difference compared with the control of MeOH (** means P < 0.01). Control, the Xoo-inoculated rice seedling leaves of cultivar IR24 untreated with methanol or TKA. MeOH, the Xoo-inoculated rice seedling leaves of cultivar IR24 treated with methanol (0.3%, v/v).