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MYB Repressors as Regulators of Phenylpropanoid Metabolism in Plants

Dawei Ma¹, C Peter Constabel¹

¹Centre for Forest Biology and Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada.

Trends in Plant Science

|February 2, 2019

Abstract:

The phenylpropanoid pathway gives rise to lignin, flavonoids, and other metabolites and is regulated by MYB transcription factors. Many R2R3-MYB transcriptional activators are known, but the prevalence of MYB repressors has only recently become recognized. This review article summarizes recent progress on function and mechanism of these MYB repressors. The characterized phenylpropanoid R2R3-MYB repressors comprise two phylogenetic clades that act on the lignin and general phenylpropanoid genes, or the flavonoid genes, respectively; anthocyanin R3-MYB repressors form a separate clade. While some flavonoid MYBs repressors can bind basic-helix-loop-helix factors and disrupt the MBW complex, for the lignin repressor MYBs interactions with promoter cis-elements have been demonstrated. The role of the conserved repression motifs that define the MYB repressors is not yet known, however.

Keywords:

flavonoid gene expression lignin repressor transcription factor

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