Functional Analysis of Two Flavanone-3-Hydroxylase Genes from Camellia sinensis: A Critical Role
 
作者: 文章来源: 点击数: 更新日期:2017-11-02

Title


Functional Analysis of Two Flavanone-3-Hydroxylase Genes from Camellia sinensis: A Critical Role in Flavonoid Accumulation


Authors


Yahui Han, Keyi Huang, Yajun Liu, Tianming Jiao, Guoliang Ma, Yumei Qian, Peiqiang Wang, Xinlong Dai, Liping Gao*, Tao Xia*


Journal


Genes 2017, 8, 300; doi:10.3390/genes8110300.


Abstract


Flavonoids are major secondary metabolites in Camellia sinensis. Flavanone-3- hydroxylase (F3H) is a key enzyme in flavonoid biosynthesis in plants. However, its role in the flavonoid metabolism in C. sinensis has not been well studied. In this study, we cloned two F3Hs from C. sinensis, named CsF3Ha and CsF3Hb, where CsF3Ha containing 1107 bases encoded 368 amino acids, and CsF3Hb containing 1071 bases encoded 357 amino acids. Enzymatic activity analysis showed both recombinant CsF3H enzymes in Escherichia coli could convert naringenin and eriodictyol into dihydrokaempferol (DHK) and dihydroquercetin (DHQ), respectively. The expression profiles showed that CsF3Ha and CsF3Hb were highly expressed in the tender leaves of tea plants. Under different abiotic stresses, the two CsF3Hs were induced remarkably by ultraviolet (UV) radiation, sucrose, and abscisic acid (ABA). In the seeds of CsF3Hs transgenic Arabidopsis thaliana, the concentration of most flavonol glycosides and oligomeric proanthocyanidins increased significantly, while the content of monocatechin derivatives decreased. The present study revealed that CsF3Hs played critical roles in flavonoid biosynthesis in tea plants.




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  • functional analysis of two flavanone-3-hydroxylase genes from camellia sinensis a critical role in flavonoid accumulation(韩亚惠,高丽萍,夏涛,2017).pdf
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