ScGST3 and multiple R2R3-MYB transcription factors function in anthocyanin accumulation in Senecio cruentus. (December 2021)

• Record Type: Journal Article
• Authors: Cui, Yumeng; Fan, Jiawei; Lu, Chenfei; Ren, Jiangshan; Qi, Fangting; Huang, He; Dai, Silan
• Is Part Of: Plant science. Volume 313(2021)
• Publication Date: 2021-12
• Subjects: Anthocyanin biosynthesis -- Senecio cruentus -- Glutathione S-transferase -- MYB; Botany -- Periodicals; Botanique -- Périodiques; 580
• DOI: 10.1016/j.plantsci.2021.111094
• Languages: English
• ISSNs: 0168-9452

Abstract

Highlights: Anthocyanin accumulation in cineraria is positively correlated with the expression of ScGST3 . Expression of ScGST3 in Arabidopsis tt19 mutant complements the anthocyanin-deficient phenotype. ScGST3 increases the solubility of cyanidin-3-O-glucoside and delphinidin-3-O-glucosid. ScMYB3 and ScMYB6 are the crucial MYB TFs regulating anthocyanin in cineraria. ScMYB3 activates the promoter of ScGST3 and promotes its expression. Abstract: Anthocyanins are important flavonoid pigments involved in the colouring of flowers and fruits. They are synthesized on the cytoplasmic surface of the endoplasmic reticulum and transported into the vacuole for storage. Previous reports have suggested that glutathione S-transferase (GST) is involved in anthocyanin transport. However, due to the limitation of plant materials, most GSTs only participate in the cyanidin or delphinidin transport pathway. Here, an anthocyanin-related GST, ScGST3, was identified from the transcriptome of cineraria. The expression pattern of ScGST3 was highly consistent with anthocyanin accumulation in ray florets. Molecular complementation of Arabidopsis tt19 indicated that the overexpression of ScGST3 restores the anthocyanin-deficient phenotype of the mutant. Virus-induced gene silencing (VIGS) of ScGST3 in carmine and blue cineraria leaves could inhibit anthocyanin accumulation, further confirming the function of ScGST3 in anthocyanin accumulation. In vitro assays showed that ScGST3 increases the water solubility of cyanidin-3-O-glucoside (C3G) and delphinidin-3-O-glucosid (D3G). In addition, we also identified two anthocyanin-related MYB transcription factors, ScMYB3 and ScMYB6. The expression pattern of these two genes was also highly consistent with anthocyanin accumulation. Faded abaxial leaf phenotypes were observed after the silencing of ScMYB3 and ScMYB6, and the expression levels of partial structural genes were repressed. Based on the results from dual-luciferase assays and yeast one-hybrid assays, ScMYB3 can activate the promoter of ScGST3 . Collectively, the transcription of ScGST3 is regulated by ScMYB3, which plays an important role in the transport of C3G and D3G in cineraria.