VvBBX44 and VvMYBA1 form a regulatory feedback loop to balance anthocyanin biosynthesis in grape
文献类型： 外文期刊
作者： Liu, Wenwen 1 ; Mu, Huayuan 1 ; Yuan, Ling 6 ; Li, Yang 1 ; Li, Yuting 1 ; Li, Shenchang 1 ; Ren, Chong 1 ; Duan, Wei 1 ; Fan, Peige 1 ; Dai, Zhanwu 1 ; Zhou, Yongfeng 5 ; Liang, Zhenchang 1 ; Li, Shaohua 1 ; Wang, Lijun 1 ;
作者机构： 1.Chinese Acad Sci, Inst Bot, Beijing Key Lab Grape Sci & Enol, Beijing 100093, Peoples R China
2.Chinese Acad Sci, Inst Bot, State Key Lab Plant Divers & Specialty Crops, Beijing 100093, Peoples R China
3.China Natl Bot Garden, Beijing 100093, Peoples R China
4.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
5.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Shenzhen Branch, Natl Key Lab Trop Crop Breeding,Minist Agr & Rural, Shenzhen 518000, Peoples R China
6.Univ Kentucky, Kentucky Tobacco Res & Dev Ctr, Dept Plant & Soil Sci, Lexington, KY 40546 USA
期刊名称：HORTICULTURE RESEARCH （ 影响因子：8.7； 五年影响因子：9.0 ）
ISSN： 2662-6810
年卷期： 2023 年 10 卷 10 期
页码：
收录情况： SCI
摘要： Anthocyanins are essential for the quality of perennial horticultural crops, such as grapes. In grapes, ELONGATED HYPOCOTYL 5 (HY5) and MYBA1 are two critical transcription factors that regulate anthocyanin biosynthesis. Our previous work has shown that Vitis vinifera B-box protein 44 (VvBBX44) inhibits anthocyanin synthesis and represses VvHY5 expression in grape calli. However, the regulatory mechanism underlying this regulation was unclear. In this study, we found that loss of VvBBX44 function resulted in increased anthocyanin accumulation in grapevine callus. VvBBX44 directly represses VvMYBA1, which activates VvBBX44. VvMYBA1, but not VvBBX44, directly modulates the expression of grape UDP flavonoid 3-O-glucosyltransferase (VvUFGT). We demonstrated that VvBBX44 represses the transcriptional activation of VvUFGT and VvBBX44 induced by VvMYBA1. However, VvBBX44 and VvMYBA1 did not physically interact in yeast. The application of exogenous anthocyanin stimulated VvBBX44 expression in grapevine suspension cells and tobacco leaves. These findings suggest that VvBBX44 and VvMYBA1 form a transcriptional feedback loop to prevent overaccumulation of anthocyanin and reduce metabolic costs. Our work sheds light on the complex regulatory network that controls anthocyanin biosynthesis in grapevine.
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