Fig. 4From: Comparative analysis of powdery mildew resistant and susceptible cultivated cucumber (Cucumis sativus L.) varieties to reveal the metabolic responses to Sphaerotheca fuliginea infectionIntegrated metabolomic and transcriptomic and transcriptomic analysis of the flavonoid biosynthesis. a The relative abundances of the metabolites belonging to flavonoid-related category. b The number of up- and down-regulated flavonoid-related metabolites under the S. fuliginea infection. c Differential expression of the key genes involved the flavonoid biosynthesis pathway. “*” represents significant differences (P < 0.05). The heatmap scale ranges from − 1.5 to + 1.5 on a log2 scaleBack to article page