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g2-like CAROTENOID REgULATOR(SlgCR)is a positive regulator of lutein biosynthesis in tomato

aBIOTECH 2022年第4期3卷 267-280页

作者： Siyan Ren Yong Yuan Hsihua Wang Yang Zhang Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu610064China Sanya Institute of China Agricultural University Sanya572025China Beijing Key Laboratory of growth and Developmental Regulation for Protected Vegetable Crops College of HorticultureChina Agricultural UniversityBeijing100193China

Lutein is an oxygen-containing carotenoid synthesized in plant chloroplasts and chromoplasts.It plays an indispensable role in promoting plant growth and maintaining eye health in humans.The rate-limiting step of lutein biosynthesis is catalyzed by the lycopeneε-cyclase enzyme(LCYE).Although great progress has been made in the identification of transcription factors involved in the lutein biosynthetic pathway,many systematic molecular mechanisms remain to be elucidated.Here,using co-expression analysis,we identified a gene,g2-like CAROTENOID REgULATOR(SlgCR),encoding a garp g2-like transcription factor,as the potential regulator of SlLCYE in tomato.Silencing of SlgCR reduced the expression of carotenoid biosynthetic genes and the accumulation of carotenoids in tomato leaves.By contrast,overexpression of SlgCR in tomato fruit significantly increased the expression of relevant genes and enhanced the accumulation of carotenoids.SlgCR can directly bind to the SlLCYE promoter and activate its expression.In addition,we also discovered that expression of SlgCR was negatively regulated by the master regulator SlRIN,thereby inhibiting lutein synthesis during tomato fruit ripening.Taken together,we identified SlgCR as a novel regulator involved in tomato lutein biosynthesis,elucidated the regulatory mechanism,and provided a potential tool for tomato lutein metabolic engineering.

关键词： Solanum lycopersicum garp g2-like transcription factor Lutein biosynthesis

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