Molecular insights into TT2-type MYB regulators illuminate the complexity of floral flavonoids biosynthesis in .

Proanthocyanidins (PAs), anthocyanins, and flavonols are key flavonoids that play diverse roles in plant physiology and human health. Despite originating from a shared biosynthetic pathway, the regulatory mechanisms of PA biosynthesis and the cooperative regulation of different kinds of flavonoids remain elusive, particularly in flower tissues or organs. Here, we elucidated the regulatory network governing PA biosynthesis in 'Red River®' by characterizing four TT2-type MYB transcription factors, designated FhMYBPAs.

A functional homologue of Arabidopsis TTG1 from Freesia interacts with bHLH proteins to regulate anthocyanin and proanthocyanidin biosynthesis in both Freesia hybrida and Arabidopsis thaliana.

The MBW complex, consisting of MYB, basic helix-loop-helix (bHLH) and WD40 proteins, regulates multiple traits in plants, such as anthocyanin and proanthocyanidin biosynthesis and cell fate determination. The complex has been widely identified in dicot plants, whereas few studies are concentrated on monocot plants which are of crucial importance to decipher its functional diversities among angiosperms during evolution. In present study, a WD40 gene from Freesia hybrida, designated as FhTTG1, was cloned and functionally characterized.

The R2R3-MYB Factor FhMYB5 From Contributes to the Regulation of Anthocyanin and Proanthocyanidin Biosynthesis.

The flavonoids are important and nourishing compounds for plants and human. The transcription regulation of anthocyanin and proanthocyanidin (PA) biosynthesis was extensively studied in dicot compared with monocot plants. In this study, we characterized the functionality of an R2R3-MYB gene from the monocotyledonous flowering plant of Iridaceae, Multiple sequence alignment and phylogenetic analysis implied that FhMYB5 was clustered into grapevine VvMYB5b subclade.