Abstract
Interest in so-called functional foods, i.e., foods that promote health and disease prevention, is increasing. Consumption of plant polyphenols has been implicated in the prevention of age-related diseases, cardiovascular disease and cancer. AtMYB12 and AtMYB111, which were originally identified as flavonol-specific transcriptional activator in Arabidopsis thaliana, induces the accumulation of high levels of polyphenols in tobacco and tomato plants. In this study, we determined that the transcription factor AtMYB11 as its close homologs, AtMYB12 and AtMYB111, regulate flavonoid and caffeoylquinic acid biosynthesis in tomato and tobacco plants. Constitutive expression of AtMYB11 enhanced the expression of genes in the phenylpropanoid biosynthesis pathway, resulting in the accumulation of flavonoids and chlorogenic acid in tobacco and tomato plants. Increases in dicaffeoylquinic acid and tricaffeoylquinic acid content were only detected in AtMYB11-expressing tomato fruits. These results suggest the potential of transgenic tomatoes with improved antioxidant properties as functional foods.
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Abbreviations
- PAL:
-
Phenylalanine ammonium lyase
- C4H:
-
Cinnamate 4-hydroxylase
- CHI:
-
Chalcone isomerase
- CHS:
-
Chalcone synthase
- 4CL:
-
4-Hydroxy-cinnamoyl CoA ligase
- F3H:
-
Flavanone-3-hydroxylase
- F3′H:
-
Flavonoid-3′-hydroxylase
- FLS:
-
Flavonol synthase
- GT:
-
Flavonol-3-glucosyltransferase
- HPLC:
-
High-performance liquid chromatography
- HCT:
-
Hydroxycinnamoyl transferase
- HQT:
-
Hydroxycinnamoyl CoA quinate transferase
- C3H:
-
p-Coumaroyl ester 3-hydroxylase
- CGA:
-
Chlorogenic acid
- diCQA:
-
Dicaffeoylquinic acid
- tiCQA:
-
Tricaffeoylquinic acid
- CQA:
-
Caffeoyl quinic acid
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Acknowledgments
This work was supported by Ph.D. Programs Foundation of Ministry of Education of China (Grant No. 20123702110014), Foundation for the Author of National Excellent Doctoral Dissertation of PR China (Grant No. 201132), Promotive research fund for excellent young and middle-aged scientists of Shandong Province (BS2012SW014), the National High Technology Research and Development Program of China (2010AA10Z103) and the Taishan Scholar of Shandong Province.
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Li, Y., Chen, M., Wang, S. et al. AtMYB11 regulates caffeoylquinic acid and flavonol synthesis in tomato and tobacco. Plant Cell Tiss Organ Cult 122, 309–319 (2015). https://doi.org/10.1007/s11240-015-0767-6
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DOI: https://doi.org/10.1007/s11240-015-0767-6