Loss-of-function mutation in anthocyanidin reductase activates the anthocyanin synthesis pathway in strawberry

文献类型： 外文期刊

第一作者： Xu, Pengbo

作者： Xu, Pengbo;Ma, Chao;Li, Xinyu;Lin, Anqi;Wang, Chong;Lian, Hongli;Li, Maobai;Bai, Peng;Zhang, Liqing;Kuang, Huiyun

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关键词： Anthocyanins; Anthocyanidin reductase; Darker red fruit; MYB105; Pink fruit; Woodland strawberry

期刊名称：MOLECULAR HORTICULTURE （ 影响因子：8.1； 五年影响因子：11.0 ）

ISSN： 2730-9401

年卷期： 2024 年 4 卷 1 期

页码：

收录情况： SCI

摘要： Fruit color substantially affects consumer preferences, with darker red strawberries being economically more valuable due to their higher anthocyanin content. However, the molecular basis for the dark red coloration remains unclear. Through screening of an ethyl methanesulfonate mutant library, we identified a rg418 mutant, that demonstrated anthocyanin accumulation during early fruit development stages. Furthermore, the ripening fruits of this mutant had higher anthocyanin content than wild-type (WT) fruits. An analysis of flavonoid content in WT and rg418 mutant fruits revealed substantial changes in metabolic fluxes, with the mutant exhibiting increased levels of anthocyanins and flavonols and decreased levels of proanthocyanidins. Bulked sergeant analysis sequencing indicated that the mutant gene was anthocyanidin reductase (ANR), a key gene in the proanthocyanidin synthesis pathway. Furthermore, transcriptome sequencing revealed the increased expression of MYB105 during the early development stage of mutant fruits, which promoted the expression of UFGT (UDP-glucose flavonoid 3-O-glucosyltransferase), a key gene involved in anthocyanin synthesis, thus substantially enhancing the anthocyanin content in the mutant fruits. Additionally, mutating ANR in a white-fruited strawberry variant (myb10 mutant) resulted in appealing pink-colored fruits, suggesting the diverse roles of ANR in fruit color regulation. Our study provides valuable theoretical insights for improving strawberry fruit color.

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