SlMYB72 Regulates the Metabolism of Chlorophylls, Carotenoids, and Flavonoids in Tomato Fruit1

被引：165
作者：
Wu, Mengbo [1 ,2 ]
Xu, Xin [1 ,2 ]
Hu, Xiaowei [1 ,2 ]
Liu, Yudong [1 ,2 ]
Cao, Haohao [1 ,2 ]
Chan, Helen [3 ]
Gong, Zehao [1 ,2 ]
Yuan, Yujin [1 ,2 ]
Luo, Yingqing [1 ,2 ]
Feng, Bihong [4 ]
Li, Zhengguo [1 ,2 ]
Deng, Wei [1 ,2 ]
机构：
[1] Chongqing Univ, Sch Life Sci, Key Lab Plant Hormones & Dev Regulat Chongqing, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Ctr Plant Funct Genom, Inst Adv Interdisciplinary Studies, Chongqing 401331, Peoples R China
[3] Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA
[4] Guangxi Univ, Coll Agr, Nanning 530004, Peoples R China
来源：
PLANT PHYSIOLOGY | 2020年 / 183卷 / 03期
基金：
中国国家自然科学基金;
关键词：
CHALCONE SYNTHASE; EPIDERMAL-CELLS; GENE; ACCUMULATION; ARABIDOPSIS; EXPRESSION; CHLOROPLAST; BIOSYNTHESIS; REVEALS; PROTEIN;
D O I：
10.1104/pp.20.00156
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
A single transcription factor regulates the accumulation of several color compounds in tomato fruit. Tomato (Solanum lycopersicum) fruit ripening is accompanied by the degradation of chlorophylls and the accumulation of carotenoids and flavonoids. Tomato SlMYB72 belongs to the R2R3 MYB subfamily, is located in the nucleus, and possesses transcriptional activator activity. Down-regulation of theSlMYB72gene produced uneven-colored fruits; that is, dark green spots appeared on immature and mature green fruits, whereas yellow spots appeared on red fruits. Down-regulation ofSlMYB72increased chlorophyll accumulation, chloroplast biogenesis and development, and photosynthesis rate in fruits. This down-regulation decreased lycopene content, promoted beta-carotene production and chromoplast development, and increased flavonoid accumulation in fruits. RNA sequencing analysis revealed that down-regulation ofSlMYB72altered the expression levels of genes involved in the biosynthesis of chlorophylls, carotenoids, and flavonoids. SlMYB72 protein interacted with the auxin response factor SlARF4. SlMYB72 directly targeted protochlorophyllide reductase, Mg-chelatase H subunit, and knotted1-like homeobox2 genes and regulated chlorophyll biosynthesis and chloroplast development. SlMYB72 directly bound to phytoene synthase, zeta-carotene isomerase, and lycopene beta-cyclase genes and regulated carotenoid biosynthesis. SlMYB72 directly targeted 4-coumarate-coenzyme A ligase and chalcone synthase genes and regulated the biosynthesis of flavonoids and phenolic acid. The uneven color phenotype in RNA interference-SlMYB72 fruits was due to uneven silencing ofSlMYB72and uneven expression of chlorophyll, carotenoid, and flavonoid biosynthesis genes. In summary, this study identified important roles for SlMYB72 in the regulation of chlorophyll, carotenoid, and flavonoid metabolism and provided a potential target to improve fruit nutrition in horticultural crops.
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收藏
页码：854 / 868
页数：15
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