Fig. 4

Analysis of differentially accumulated metabolites in juice sacs of blood orange fruit under drought treatment compared with control. A Volcano map of DAMs. B Biochemical categories of DAMs and their hierarchical clustering. C Scatter diagram of pathway enrichment of DAMs. D-H Clustering of DAMs belonging to various KEGG pathway; D phenylalanine metabolism; E valine, leucine and isoluecine degradation/biosynthesis; F glucosinolate biosynthesis; G tyrosine metabolism; H phenylpropanoid biosynthesis. The color indicates the accumulation level of each metabolite, from low (green) to high (red). The data was standardized by Z-score. “PH0d-CK” and “PH0d-SD” means samples from control and drought treatment blood orange fruit at mature stage, respectively; All of these DAMs were listed in Table S2