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. 2016 Jun 3;7:763. doi: 10.3389/fpls.2016.00763

Figure 1.

Figure 1

Flavonoid biosynthetic pathway in plant cells and regulatory gene regulation of this pathway in Arabidopsis. Green and red circles indicate activation and repression, respectively. MYB, myeloblast; PAP, production of anthocyanin pigment; TT8, transparent testa A8; bHLHs, basic helix-loop-helix proteins; TTG1, transparent testa glabrous1; SPL9, squamosa promoter binding protein-like 9; PAL, phenyalanine ammonia-lyase; C4H, cinnamic acid 4-hydroxylase; 4CL, 4-coumarate CoA ligase; CHS, chalcone synthase; CHI, chalcone isomerase; F3H, flavanone 3′-hydroxylase; F3′H, flavonoid 3′-hydroxylase; F3′5′H, flavonoid 3′5′-hydroxylase; DFR, dihydroflavonol reductase; LDOX, leucoanthocyanidin oxidase; UGFT, UDP-glucose flavonoid 3-O-glucosyl transferase; FLS, flavonol synthase; LAR, leucoanthocyanidin reductase; ANR, anthocyanidin reductase (After Pandey et al., 2014).