Figure 2. Heatmap of the arbitrary content of identified (at least up to class) metabolites in the youngest completely developed leaf of the pea cv. Finale at different developmental stages.

The heatmap is combined with a hierarchical clustering dendrogram (distances represent the correlation of the metabolite concentrations, Ward method). Data are normalized per sample median, log₂-transformed and standardized. The number after ‘_’ is the retention index (RI), mag, monoacylglycerol, disac, trisac, di and trisacharides, or their derivates. contr, control plants, AM, plants inoculated with R. irregularis. Stage descriptions given in Fig. 1.