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. 2020 Sep 23;11:576054. doi: 10.3389/fpls.2020.576054

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Copyright © 2020 Han, Yin, Zhao, Sun, Meng, Zhou, Shen, Li and Zhang

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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A simplified model of flower color fading of M. halliana. During flower development, hypermethylation in the MhMYB10 promoter, especially −2003 to −1745 bp and −950 to −656 bp, repressed the expression of MhMYB10. MhMYB10 influenced the transcription of structural genes (e.g., MhANS, MhDFR, and MhCHS), which decreased the anthocyanin biosynthesis. In additionally, genes expressions in anthocyanin transport and degradation were downregulated or upregulated, which may influence anthocyanin content. Finally, these complex process resulted in decline of anthocyanin content, so the flower color faded.