Maize is an important crop whose lignocellulosic biomass can be used as feed for ruminants and for the production of renewable raw materials. Lignocellulosic biomass consists mainly of cell walls composed of cellulose, hemicellulose and lignin. The structure and composition of lignocellulosic biomass has evolved to provide strength and protection to plants, but this makes it difficult to break down such biomass during digestion in ruminants or industrial processes. In this thesis we develop maize varieties, through gene editing, with a lower lignin content and improved processability. These new varieties are then tested in the greenhouse and the field.