AI Article Synopsis
- Bougainvillea is a tropical flower known for its vibrant bracts, yet the genetic basis for their color formation is not fully understood.
- The study conducted a comprehensive analysis of metabolites and genes in two different color bracts of Bougainvillea × buttiana 'Chitra', identifying 261 significant metabolites, including various flavonoids and alkaloids, as well as 3,610 differentially expressed genes.
- Findings suggest that specific metabolic pathways for flavonols and betalains play crucial roles in color differences, and identified transcription factors may regulate the expression of these important genes, revealing a complex regulatory network that can aid in breeding for new flower colors.
Article Abstract
Bougainvillea is a typical tropical flower of great ornamental value due to its colorful bracts. The molecular mechanism behind color formation is not well-understood. Therefore, this research conducted metabolome analysis, transcriptome analysis, and multi-flux full-length sequencing in two color bracts of Bougainvillea × buttiana 'Chitra' to investigate the significantly different metabolites (SDMs) and differentially expressed genes (DEGs). Overall, 261 SDMs, including 62 flavonoids and 26 alkaloids, were detected, and flavonols and betalains were significantly differentially accumulated among the two bracts. Furthermore, the complete-length transcriptome of Bougainvillea × buttiana was also developed, which contained 512 493 non-redundant isoforms. Among them, 341 210 (66.58%) displayed multiple annotations in the KOG, GO, NR, KEGG, Pfam, Swissprot, and NT databases. RNA-seq findings revealed that 3610 DEGs were identified between two bracts. Co-expression analysis demonstrated that the DEGs and SDMs involved in flavonol metabolism (such as CHS, CHI, F3H, FLS, CYP75B1, kaempferol, and quercetin) and betacyanin metabolism (DODA, betanidin, and betacyanins) were the main contributors for the canary yellow and red bract formation, respectively. Further investigation revealed that several putative transcription factors (TFs) might interact with the promoters of the genes mentioned above. The expression profiles of the putative TFs displayed that they may positively and negatively regulate the structural genes' expression profiles. The data revealed a potential regulatory network between important genes, putative TFs, and metabolites in the flavonol and betacyanin biosynthesis of Bougainvillea × buttiana 'Chitra' bracts. These findings will serve as a rich genetic resource for future studies that could create new color bracts.
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Article Synopsis
- Bougainvillea is a tropical flower known for its vibrant bracts, yet the genetic basis for their color formation is not fully understood.
- The study conducted a comprehensive analysis of metabolites and genes in two different color bracts of Bougainvillea × buttiana 'Chitra', identifying 261 significant metabolites, including various flavonoids and alkaloids, as well as 3,610 differentially expressed genes.
- Findings suggest that specific metabolic pathways for flavonols and betalains play crucial roles in color differences, and identified transcription factors may regulate the expression of these important genes, revealing a complex regulatory network that can aid in breeding for new flower colors.
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