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- W4387474311 abstract "Abstract Carotenoids directly influence citrus fruit color and nutritional value, which is critical to consumer acceptance. Elucidating the potential molecular mechanism underlying carotenoid metabolism is of great importance for improving fruit quality. Despite the well-established carotenoid biosynthetic pathways, the molecular regulatory mechanism underlying carotenoid metabolism remains poorly understood. Our previous studies have reported that the Myc-type basic helix-loop-helix (bHLH) transcription factor (TF) regulates citrus proanthocyanidin biosynthesis. Transgenic analyses further showed that overexpression of CsTT8 could significantly promote carotenoid accumulation in transgenic citrus calli, but its regulatory mechanism is still unclear. In the present study, we found that overexpression of CsTT8 enhances carotenoid content in citrus fruit and calli by increasing the expression of CsDXR, CsHDS, CsHDR, CsPDS, CsLCYE, CsZEP, and CsNCED2, which was accompanied by changes in the contents of abscisic acid (ABA) and gibberellin (GA). The in vitro and in vivo assays indicated that CsTT8 directly bound to the promoters of CsDXR, CsHDS, and CsHDR, the key metabolic enzymes of methylerythritol 4-phosphate (MEP) pathway, thus providing precursors for carotenoid biosynthesis and transcriptionally activating the expression of these 3 genes. In addition, CsTT8 activated the promoters of four key carotenoid biosynthesis pathway genes, CsPDS, CsLCYE, CsZEP, and CsNCED2, directly promoting carotenoid biosynthesis. This study reveals a novel network of carotenoid metabolism regulated by CsTT8. Our findings will contribute to manipulating carotenoid metabolic engineering to improve the quality of citrus fruit and other crops." @default.
- W4387474311 created "2023-10-11" @default.
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- W4387474311 date "2023-10-10" @default.
- W4387474311 modified "2023-10-16" @default.
- W4387474311 title "Transcription factor CsTT8 promotes fruit coloration by positively regulating methylerythritol 4-phosphate pathway and carotenoid biosynthesis pathway in citrus (<i>Citrus spp.</i>)" @default.
- W4387474311 doi "https://doi.org/10.1093/hr/uhad199" @default.
- W4387474311 hasPublicationYear "2023" @default.
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