Figure 7.

Unsupervised hierarchical clustering of metabolites and cultivars affected by drought; normalized lines (centered and reduced) of Log (content I/content NI), calculated for all variables, with polyphenol concentrations expressed in mg berry⁻¹, on the 2014 data set. Codes for variables and cultivars are provided in Table 1 and Table S2, respectively. Clusters of the different polyphenol groups are colored differently: anthocyanin (red; f1: mono hydroxylated and f2: di-hydroxylated), anthocyanin derived pigments (purple; c), hydroxycinnamic acids and their anthocyanin derivatives(dark red; d).flavonols and dihydroflavonols (yellow; a: mono- and di-hydroxylated; g1 and g2: trihydroxylated), flavan-3-ols (blue; b: tannin subunits and sum of flavan-3-ols; e1 and e2: flavan-3-ol monomers and terminal units), stilbenes (gray; h). Subgroups of cultivars (1-1-1, 1-1-2, …) and significantly different distribution of colors (mostly colored: C, in red; mostly White: W, in green), genetic origin (WW) and precocity (early, late) in individual subgroups compared to the entire population (see Figures 9, 10, and Table S3) are also illustrated.