Sugarcane bagasse has received attention as a raw material for the production of second-generation ethanol (E2G). However, its use is limited because of the cell wall recalcitrance, mostly conferred by lignin. Recently our knowledge of the genes coding for the enzymes of the lignin biosynthesis pathway has increased; however, still little is known about the transcription factors controlling the expression of these genes in sugarcane. Here we describe protocols to optimize the isolation of the promoters of the lignin biosynthetic genes ShCAD8, ShCOMT and ShF5H and the transcription factors (TFs) ShMYB85 and ShMYB58/63 in Saccharum species. To confirm whether these TFs are able to activate the target promoters, a transactivation assay in BY2 protoplasts of Nicotiana tabacum is also detailed.
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