NOVELTY - Producing one or more cell wall-degrading enzyme, comprises (i) expressing in plants or the plant parts one or more heterologous cell wall-degrading enzyme, harvesting the plants or the plant parts containing the heterologous cell wall-degrading enzyme, and storing the harvest as a silage.    USE - The process is useful for producing cell wall-degrading enzymes for degrading plant cell wall components of plant material for producing bioalcohol such as bioethanol (all claimed).    ADVANTAGE - The process is capable of easily and efficiently producing cell wall-degrading enzymes in a cost-effective manner.    DETAILED DESCRIPTION - Producing one or more cell wall-degrading enzyme, comprises: either (i) expressing in plants or the plant parts one or more heterologous cell wall-degrading enzyme, (ii) harvesting the plants or the plant parts containing the heterologous cell wall-degrading enzyme, and (iii) storing the harvest as a silage; or transfecting plants or the plant parts with a nucleic acid molecule comprising a nucleic acid construct containing a nucleotide sequence encoding the cell wall-degrading enzyme and expressing in the plants or the plant parts the cell wall-degrading enzyme, and the steps (ii) and (iii) as above per se. INDEPENDENT CLAIMS are included for:    (1) a process of storing cell wall-degrading enzymes, comprising storing, in a silage, plants or plant parts containing the expressed enzyme capable of degrading a plant cell wall component, where the plant or plant parts contain the enzyme targeted to the apoplast or to plastids of the plant or plant parts;    (2) silage containing the active cell wall-degrading enzyme capable of degrading a plant cell wall component, where the silage obtainable by fermenting plants or plant parts contain expressed the cell wall-degrading enzyme that is heterologous to the plants or the plant part;    (3) a process of degrading plant cell wall components of plant material, comprising treating the plant material in an aqueous reaction medium with the silage or with the preparation obtainable by the process;    (4) a process of producing a bioalcohol such as bioethanol from plant material, comprising (a) treating the plant material, or a product obtained by pre-treatment of the plant material, in an aqueous reaction medium with the silage or with the preparation obtainable for producing glucose from cellulose contained in the plant material, and (b) fermenting the product obtained in the step (a) for producing the bioalcohol from the glucose, where the steps (a) and (b) is performed simultaneously in the same reaction vessel or consecutively.