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Updated: Aug 11, 2025

Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics
Published on: June 17, 2012
PlgMYBR1, an R2R3-MYB transcription factor, plays as a negative regulator of anthocyanin biosynthesis in Platycodon
1Department of Industrial Plant Science and Technology, College of Agricultural, Life and Environmental Sciences, Chungbuk National University, Cheongju, 28644 Republic of Korea.
Abstract:
Floral color plays a major role in pollinator specificity, and changes in color may result in pollinator shifts and pollinator-mediated speciation. In the purple flowers of Platycodon grandiflorus, anthocyanins are the major pigment metabolites, whereas white flowers result due to the absence of anthocyanins. The lack of anthocyanins may be due to the inhibition of the anthocyanin biosynthesis pathway. However, the molecular mechanism of anthocyanin biosynthesis in P. grandiflorus is not fully understood. Hence, we identified R2R3-MYB transcription factor, PlgMYBR1, as a negative regulator for anthocyanin biosynthesis using sequence homology and tissue-specific expression pattern analyses. A heterologous co-expression assay suggested that PlgMYBR1 inhibited the function of AtPAP1 (Arabidopsis thaliana production of anthocyanin pigment 1), indicating that PlgMYBR1 plays as a repressor of anthocyanin biosynthesis in P. grandiflorus. Our results provide a foundation for future efforts to understand the anthocyanin biosynthesis in P. grandiflorus and, thereby, to improve flower color through genetic engineering.
Supplementary Information:
The online version contains supplementary material available at 10.1007/s13205-023-03490-6.
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