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Simplified, schematic representation of the biosynthesis of flavonols and anthocyanidins. Abbreviations of the enzyme designations are CHS, chalcone synthase; CHI, chalcone flavanone isomerase; F3H, flavanone 3-hydroxylase; FLS, flavonol synthase; F3′H, flavonoid 3′-hydroxylase; DFR, dihydroflavonol 4-reductase. Note that for the biosynthesis of flavonols the action of FLS is required while for the formation of anthocyanins DFR is necessary.
