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. 2018 Dec 11;9:1742. doi: 10.3389/fpls.2018.01742

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Copyright © 2018 Bonar, Liney, Zhang, Austin, Dessoly, Davidson, Stephens, McDougall, Taylor, Bryan and Hornyik.

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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Summary of the findings for small RNA directed gene regulation of anthocyanin biosynthesis in potato. Purple tuber skin and flesh tissues show high levels of miR828 and TAS4 D4(-) and reduced expression of MYB genes (R2R3MYB, MYB-36284). The down-regulation of anthocyanin biosynthesis inhibitors results in the appearance of purple color. In contrast, white and yellow tissues have low accumulation levels of small RNAs allowing higher expression of MYB genes (R2R3MYB, MYB-36284). High levels of MYB transcription factors inhibits anthocyanin biosynthesis in skin and flesh tissues resulting in white or yellow color formation. Other, yet unknown factors might influence color development regulated directly or indirectly by small RNAs represented as a triangle.