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Background  Because flavonoids and trichomes play crucial roles in plant defence, their formation requires fine transcriptional control by multiple transcription factor families. However, little is known regarding the mechanism of the R2R3-MYB transcription factors that regulate both flavonoid metabolism and trichome development.    Results  Here, we identified a unique SG4-like-MYB TF from Tartary buckwheat,  FtMYB8 , which harbours the C2 repression motif and an additional TLLLFR repression motif. The expression profiles of  FtMYB8  combined with the transcriptional activity of  P   FtMYB8   promoter showed that  FtMYB8  mRNA mainly accumulated in roots during the true leaf stage and flowering stage and in bud trichomes and flowers, and the expression of this gene was markedly induced by MeJA, ABA and UV-B treatments but repressed by dark treatment. Overexpression of  FtMYB8  in Arabidopsis reduces the accumulation of anthocyanin/proanthocyanidin by specifically inhibiting  TT12  expression, which may depend on the interaction between FtMYB8 and TT8. Interestingly, this interaction may also negatively regulate the marginal trichome initiation in Arabidopsis leaves.    Conclusions  Taken together, our results suggest that  FtMYB8  may fine-tune the accumulation of anthocyanin/proanthocyanidin in the roots and flowers of Tartary buckwheat by balancing the inductive effects of transcriptional activators, and probably regulate trichome distribution in the buds of Tartary buckwheat.    Electronic supplementary material  The online version of this article (10.1186/s12870-019-1876-x) contains supplementary material, which is available to authorized users.

FtMYB8 from Tartary buckwheat inhibits both anthocyanin/Proanthocyanidin accumulation and marginal Trichome initiation