Abstract
Main conclusion
This study showed that an R2R3-MYB transcription factor, OjMYB1, is involved in anthocyanin biosynthesis and accumulation in Oenanthe javanica.
Anthocyanins can be used as safe natural food colorants, obtained from many plants. R2R3-MYB transcription factors (TFs) play important roles in anthocyanins biosynthesis during plant development. Oenanthe javanica is a popular vegetable with high nutritional values and numerous medical functions. O. javanica has purple petioles that are mainly due to anthocyanins accumulation. In the present study, the gene encoding an R2R3-MYB TF, OjMYB1, was isolated from purple O. javanica. Sequencing results showed that OjMYB1 contained a 912-bp open reading frame encoding 303 amino acids. Sequence alignments revealed that OjMYB1 contained bHLH-interaction motif ([DE]Lx2[RK]x3Lx6Lx3R) and ANDV motif ([A/G]NDV). Phylogenetic analysis indicated that the OjMYB1 classified into the anthocyanins biosynthesis clade. Subcellular localization assay showed that OjMYB1 was a nuclear protein in vivo. The heterologous expression of OjMYB1 in Arabidopsis could enhance the anthocyanins content and up-regulate the expression levels of the structural genes-related anthocyanins biosynthesis. Yeast two-hybrid assay indicated that OjMYB1 could interact with AtTT8 and AtEGL3 proteins. Enzymatic analysis revealed that overexpression of OjMYB1 gene up-regulated the enzyme activity of 3-O-glycosyltransferase encoded by AtUGT78D2 in transgenic Arabidopsis. Our results provided a comprehensive understanding of the structure and function of OjMYB1 TF in O. javanica.
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Abbreviations
- CHI:
-
Chalcone isomerase
- CHS:
-
Chalcone synthase
- DFR:
-
Dihydroflavonol 4-reductase
- F3H:
-
Flavanone 3-hydroxylase
- F3′H:
-
Flavonoid 3′-hydroxylase
- fw:
-
Fresh weight
- LDOX:
-
Leucoanthocyanidin dioxygenase
- ORF:
-
Open reading frame
- TF:
-
Transcription factor
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Acknowledgements
The research was supported by the New Century Excellent Talents in University (NCET-11-0670); National Natural Science Foundation of China (31272175; 31501775); Jiangsu Natural Science Foundation (BK20130027); Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Feng, K., Xu, ZS., Que, F. et al. An R2R3-MYB transcription factor, OjMYB1, functions in anthocyanin biosynthesis in Oenanthe javanica . Planta 247, 301–315 (2018). https://doi.org/10.1007/s00425-017-2783-8
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DOI: https://doi.org/10.1007/s00425-017-2783-8