Fig. 2.

Transcriptomics and widely targeted metabolome analyses of Periploca forrestii. A. Classification of the detected metabolites (left). Heatmap (right) showing the contents of different flavonoid compounds in the leaves, roots, and stems of P. forrestii. B. Upregulated and downregulated flavonoid metabolites in stem vs. leaves, roots vs. leaves, and roots vs. stems. C. Proposed biosynthetic pathway of flavonoid glycosides in P. forrestii. The heatmap beneath the structures of compounds represents their content in the roots, stems, and leaves. D. Expression heatmap of flavonoid biosynthesis-related genes with log10 FPKM in the roots, stems, and leaves.