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. 2021 Dec 10;12:781236. doi: 10.3389/fpls.2021.781236

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Copyright © 2021 Zhang, Zhang, Zou, Qiu, Zheng, Yang and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Structures of some bioactive polyphenols in medicinal plants (A) and the effects of light quality on the transcripts of key enzyme genes in the biosynthetic pathways of polyphenols (B). The upward arrows indicate upregulation and the downward arrows indicate downregulation. The purple arrow, red arrow, and blue arrow indicate UV-B, red light, and blue light, respectively. ANR, anthocyanidin reductase; ANS, anthocyanidin synthase; CHS, chalcone synthase; CHI, chalcone isomerase; CYP98A14, cytochrome p450 98A14; C4H, cinnamic acid 4-hydroxylase; DFR, dihydroflavonol 4-reductase; FLS, flavonol synthase; F3′H, flavonol 3′-hydroxylase; F3H, flavanone 3-hydroxylase; HPPR, 4-hydroxyphenylpyruvate reductase; LAR, leucoanthocyanidin reductase; PAL, phenylalanine ammonia-lyase; RAS, rosmarinic acid synthase; TAT, tyrosine aminotransferase; UFGT, UDP flavonoid glucosyltransferase; 4CL, 4-coumaric acid: CoA ligase.