Figure 4.
Flavonoid metabolism during reproduction. A, Expression profiles of transcription factors regulating flavonoid biosynthetic genes during reproduction. TTG1/2, TRANSPARENT TESTA GLABROUS 1/2; TT2/8/16, TRANSPARENT TESTA 2/8/16; EGL1, ENHANCER OF GLABRA 1; PAP1/2, PRODUCTION OF ANTHOCYANIN PIGMENT 1/2. B, Scheme of the hierarchy of transcription factors regulating flavonoid biosynthetic genes (modified after Zhang et al., 2003). C, Scheme of flavonoid biosynthesis and observed changes of gene expression during reproduction. CHS, CHALCONE SYNTHASE; CHI, CHALCONE ISOMERASE; F3H, FLAVANONE 3-β-HYDROXYLASE; F3′H, FLAVONOID 3′-HYDROXYLASE; DFR, DIHYDROFLAVONOL REDUCTASE; LDOX, LEUCOANTHOCYANIDIN OXIDASE; BAN, BANYULS; UFGT, UDP-FLAVONOID GLYCOSYL TRANSFERASE; TT19, TRANSPARENT TESTA 19.