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The Arabidopsis flavonoid biosynthetic pathway. The Arabidopsis mutants in the early part of the pathway are bracketed. The mutants used in these experiments are in bold type. The insets show the chemical structures of N (a flavanone) and Q (a flavonol). Enzyme abbreviations: CHI, chalcone isomerase; CHS, chalcone synthase; DFR, dihydroflavonol reductase; F3H, flavonol 3-hydroxylase; FLS, flavonol synthase. The figure is modified from Buer and Muday (2004).
