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A Transcriptional Network Promotes Anthocyanin Biosynthesis in Tomato Flesh

文献类型： 外文期刊

作者： Sun, Chuanlong 1 ; Deng, Lei 1 ; Du, Minmin 3 ; Zhao, Jiuhai 4 ; Chen, Qian 4 ; Huang, Tingting 5 ; Jiang, Hongling 1 ; L 1 ;

作者机构： 1.Chinese Acad Sci, Innovat Acad Seed Design, Inst Genet & Dev Biol, State Key Lab Plant Genom,Natl Ctr Plant Gene Res, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Beijing Vegetable Res Ctr, Minist Agr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

4.Shandong Agr Univ, Coll Agron, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China

5.Qingdao Acad Agr Sci, Inst Vegetable, Qingdao 266100, Shandong, Peoples R China

关键词： anthocyanin biosynthesis; purple tomato; MBW complex; master regulator; transcriptional regulation

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2020 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Dietary anthocyanins are important health-promoting antioxidants that make a major contribution to the quality of fruits. It is intriguing that most tomato cultivars do not produce anthocyanins in fruit. However, the purple tomato variety Indigo Rose, which has the dominant Aft locus combined with the recessive atv locus from wild tomato species, exhibits light-dependent anthocyanin accumulation in the fruit skin. Here, we report that Aft encodes a functional anthocyanin activator named SlAN2-like, while atv encodes a nonfunctional version of the anthocyanin repressor SlMYBATV. The expression of SlAN2-like is responsive to light, and the functional SlAN2-like can activate the expression of both anthocyanin biosynthetic genes and their regulatory genes, suggesting that SlAN2-like acts as a master regulator in the activation of anthocyanin biosynthesis. We further showed that cultivated tomatoes contain nonfunctional alleles of SlAN2-like and therefore fail to produce anthocyanins. Consistently, expression of a functional SlAN2-like gene driven by the fruit-specific promoter in a tomato cultivar led to the activation of the entire anthocyanin biosynthesis pathway and high-level accumulation of anthocyanins in both the peel and flesh. Taken together, our study exemplifies that efficient engineering of complex metabolic pathways could be achieved through tissue-specific expression of master transcriptional regulators.

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