Differentially evolved glucosyltransferases determine natural variation of rice flavone accumulation and UV-tolerance

Meng Peng, Raheel Shahzad, Ambreen Gul, Hizar Subthain, Shuangqian Shen, Long Lei, Zhigang Zheng, Junjie Zhou, Dandan Lu, Shouchuang Wang, Elsayed Nishawy, Xianqing Liu, Takayuki Tohge, Alisdair R. Fernie and Jie Luo ()
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Meng Peng: Huazhong Agricultural University
Raheel Shahzad: Huazhong Agricultural University
Ambreen Gul: Huazhong Agricultural University
Hizar Subthain: Huazhong Agricultural University
Shuangqian Shen: Huazhong Agricultural University
Long Lei: Huazhong Agricultural University
Zhigang Zheng: Huazhong Agricultural University
Junjie Zhou: Huazhong Agricultural University
Dandan Lu: Huazhong Agricultural University
Shouchuang Wang: Huazhong Agricultural University
Elsayed Nishawy: Huazhong Agricultural University
Xianqing Liu: Huazhong Agricultural University
Takayuki Tohge: Nara Institute of Science and Technology, Ikoma
Alisdair R. Fernie: Max-Planck-Institute of Molecular Plant Physiology
Jie Luo: Huazhong Agricultural University

Nature Communications, 2017, vol. 8, issue 1, 1-12

Abstract: Abstract Decoration of phytochemicals contributes to the majority of metabolic diversity in nature, whereas how this process alters the biological functions of their precursor molecules remains to be investigated. Flavones, an important yet overlooked subclass of flavonoids, are most commonly conjugated with sugar moieties by UDP-dependent glycosyltransferases (UGTs). Here, we report that the natural variation of rice flavones is mainly determined by OsUGT706D1 (flavone 7-O-glucosyltransferase) and OsUGT707A2 (flavone 5-O-glucosyltransferase). UV-B exposure and transgenic evaluation demonstrate that their allelic variation contributes to UV-B tolerance in nature. Biochemical characterization of over 40 flavonoid UGTs reveals their differential evolution in angiosperms. These combined data provide biochemical insight and genetic regulation into flavone biosynthesis and additionally suggest that adoption of the positive alleles of these genes into breeding programs will likely represent a potential strategy aimed at producing stress-tolerant plants.

Date: 2017
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DOI: 10.1038/s41467-017-02168-x

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