Figure 8.

Fusaric acid (FSA) promoted lesion formation of Fusarium oxysporum f. sp. cubense tropical race 4 (Foc TR4) in banana leaves through reactive oxygen species (ROS) production. (a) Banana leaves were infiltrated with 0.1% MEOH or Foc TR4 together with 0.1% MEOH, mixture of glucose oxidase (25 units ml⁻¹) plus 2.5 mM glucose (G+GO), mixture of xanthine oxidase (0.05 units ml⁻¹) plus 0.5 mM xanthine (X+XO), 300 μM FSA, or 10 μM DPI. Foc TR4 was inoculated in the center of the infiltrated area 2 h later. Photographs were taken 5 d post‐inoculation (dpi). The white squares indicate cell death lesions in leaves. Bar, 1 cm. (b) Disease progress was evaluated at 5 dpi by measuring lesion length. The data are shown as the means ± SD from three independent experiments and different letters above the columns indicate the significant difference (P < 0.05) between different treatments.