Fig. 4
Phenotypic differences and disease index of cucumber seedlings. a, b Phenotypic differences of cucumber seedlings. The one third of seedlings roots treated with mock solutions, one third were inoculated with a Foc strain (spore concentration 106 conidia/mL), and the others were inoculated with Foc and sprayed with exogenous ethephon on leaves (concentration 10 ppm, Foc + ET) at the same time. c, d Disease index for the phenotypes of the cucumber seedlings. The Y-axis indicates the disease index. The typical phenotypic differences and disease index were recorded and calculated 3 weeks after treatment. R, ‘Rijiecheng’ (Foc-resistant line), S, ‘Superina’, (Foc-sensitive line)