Grape phytochrome-interacting factor VvPIF1 negatively regulates carotenoid biosynthesis by repressing VvPSY expression
文献类型： 外文期刊
作者： Zhuge, Yaxian 1 ; Sheng, Hongjie 2 ; Zhang, Mengwei 1 ; Fang, Jinggui 1 ; Lu, Suwen 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Hort, Nanjing, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Nanjing, Peoples R China
关键词： Phytochrome-interacting factor; Light; Carotenoid; Grape(Vitis); Fruit
期刊名称：PLANT SCIENCE （ 影响因子：5.2； 五年影响因子：5.7 ）
ISSN： 0168-9452
年卷期： 2023 年 331 卷
页码：
收录情况： SCI
摘要： Phytochrome-interacting factors (PIFs) play important roles in light-mediated secondary metabolism; however, the roles of PIFs in grape fruit carotenogenesis remain unclear. Here, by identifying the PIF family genes in grapes, we focused on the role of VvPIF1 in carotenoid metabolism. During grape berry development, VvPIF1 expression was negatively correlated with carotenoid accumulation and the transcription of phytoene synthase 1/2 (VvPSY1/2), which encodes the major flux-controlling enzymes for carotenoid biosynthesis. Light signifi-cantly repressed VvPIF1 expression, but induced the expression of carotenogenic genes including VvPSY1/2. VvPIF1 functioned as a nucleus-localized protein and interacted with the light photoreceptor VvphyB. Over-expression of VvPIF1 resulted in the downregulation of the endogenous PIF1 gene, which may unexpectedly induce carotenoid accumulation and PSY expression in tobacco leaves. The transgenic grape leaves and tomato fruits with high VvPIF1 expression produced a significant decrease in carotenoid concentrations, with suppressed transcription of PSY and other carotenogenic genes. Further biochemical assays demonstrated that VvPIF1 bound directly to the promoters of VvPSY1/2 to inhibit their transcription. Collectively, we conclude that VvPIF1 negatively regulates carotenoid biosynthesis by repressing VvPSY expression in grapes. These findings shed light on the role and mode of action of PIFs in the carotenoid regulatory network of grapes.
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