The E3 ubiquitin ligase COP1 inhibits sugar and anthocyanin accumulation in strawberry fruit

文献类型： 外文期刊

第一作者： Bi, Xiaoyi

作者： Bi, Xiaoyi;Zhu, Yuxuan;Fan, Junmiao;Zhang, Lianxi;Lin, Anqi;Wang, Chong;Xu, Pengbo;Lian, Hongli;Liu, Zhongchi;Zhang, Liqing;Kuang, Huiyun

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：6.9； 五年影响因子：7.7 ）

ISSN： 0032-0889

年卷期： 2025 年 198 卷 4 期

页码：

收录情况： SCI

摘要： Light strongly affects strawberry fruit quality. The ubiquitin E3 ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) negatively regulates light signaling. However, its role in fruit quality remains unclear. This study demonstrates that FvCOP1 plays a negative role in strawberry fruit quality. Here, we generated fvcop1 knockout mutants in diploid strawberry (Fragaria vesca). The mutants showed substantial changes in fruit color and shape. Metabolomic analyses revealed elevated levels of sugars, anthocyanins, vitamins, lignin, flavonoids, and phenolic acids in fvcop1 mutants compared with wild type. Transcriptome analysis identified key genes in sugar, anthocyanin, flavonoid, and lignin biosynthesis pathways. Moreover, FvCOP1 suppresses the accumulation of sugars, anthocyanins, and flavonoids by inhibiting transcriptional activation of downstream genes regulated by FvHY5, FvRIF, and FvMYB10. We demonstrated that FvHY5 and FvRIF directly bind to promoters of sugar/anthocyanin biosynthesis genes to activate their expression. Furthermore, FvCOP1 ubiquitinates FvHY5, FvMYB10, and FvRIF, leading to their destabilization and thereby repressing sugar and anthocyanin production. These findings establish FvCOP1 as a molecular brake on light-mediated fruit quality improvement. Targeting FvCOP1 in breeding programs could enhance strawberry nutritional and commercial value by optimizing light-responsive metabolite accumulation. COP1 negatively regulates strawberry fruit quality by ubiquitinating and destabilizing the transcription factors FvHY5, FvMYB10, and FvRIF, thereby suppressing sugar and anthocyanin biosynthesis.

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