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. 2011 Apr;23(4):1512–1522. doi: 10.1105/tpc.111.084525

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© 2011 American Society of Plant Biologists

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Figure 7. — A Model for Negative Regulation of Anthocyanin Biosynthesis by miR156-Targeted SPLs.

Anthocyanins accumulate in an acropetal manner, with the highest level at the junction between rosette and stem. This pattern is regulated by miR156-targeted SPL genes. High levels of SPLs in the inflorescences repress anthocyanin accumulation by directly preventing expression of anthocyanin biosynthetic genes, such as ANS, F3′H, DFR, and UGT75C1, through destabilization of the MYB-bHLH-WD40 transcriptional activation complex.