Fusaric acid (FSA) spreads ahead of the invasion of Fusarium oxysporum f. sp. cubense tropical race 4 (Foc
TR4) inside banana plant. (a) Detection of GFP‐tagged Foc
TR4 (green, arrows) by Laser Confocal Microscope in Cavendish banana roots from 2 to 9 d post‐inoculation (dpi) and in pseudostems at 12 and 14 dpi. Bars: root, 50 μm; pseudostem, 200 μm). (b–e) The relative fungal growth (b, d) and FSA production (c, e) from Day 0 to 12 dpi in roots (d, e) and pseudostems (b, c). Data presented in (b) to (e) are the means ± SD from three independent experiments and different letters above the columns indicate the significant difference (P < 0.05) among the different time points.