A R2R3-MYB Transcription Factor, VvMYBC2L2, Functions as a Transcriptional Repressor of Anthocyanin Biosynthesis in Grapevine (Vitis vinifera L.)
文献类型： 外文期刊
作者： Zhu, Ziguo 1 ; Li, Guirong 2 ; Liu, Li 1 ; Zhang, Qingtian 1 ; Han, Zhen 1 ; Chen, Xuesen 3 ; Li, Bo 1 ;
作者机构： 1.Shandong Acad Agr Sci, Shandong Inst Pomol, 66 Longtan Rd, Tai An 271000, Shandong, Peoples R China
2.Henan Inst Sci & Technol, Coll Hort & Landscape Architecture, Xinxiang 453003, Henan, Peoples R China
3.Shandong Agr Univ, Coll Hort Sci & Engn, 61 Daizong Rd, Tai An 271000, Shandong, Peoples R China
关键词： grapevine; anthocyanin; MYB transcription factor; repressor; flavonoid pathway
期刊名称：MOLECULES （ 影响因子：4.411； 五年影响因子：4.587 ）
ISSN： 1420-3049
年卷期： 2019 年 24 卷 1 期
页码：
收录情况： SCI
摘要： In grapevine, the MYB transcription factors play an important role in the flavonoid pathway. Here, a R2R3-MYB transcription factor, VvMYBC2L2, isolated from Vitis vinifera cultivar Yatomi Rose, may be involved in anthocyanin biosynthesis as a transcriptional repressor. VvMYBC2L2 was shown to be a nuclear protein. The gene was shown to be strongly expressed in root, flower and seed tissue, but weakly expressed during the fruit development in grapevine. Overexpressing the VvMYBC2L2 gene in tobacco resulted in a very marked decrease in petal anthocyanin concentration. Expression analysis of flavonoid biosynthesis structural genes revealed that chalcone synthase (CHS), dihydroflavonol 4-reductase (DFR), leucoanthocyanidin reductase (LAR) and UDP glucose flavonoid 3-O-glucosyl transferase (UFGT) were strongly down-regulated in the VvMYBC2L2-overexpressed tobacco. In addition, transcription of the regulatory genes AN1a and AN1b was completely suppressed in transgenic plants. These results suggested that VvMYBC2L2 plays a role as a negative regulator of anthocyanin biosynthesis.
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