NOVELTY - Process for improving digestibility and ingestibility of a plant, and its degradability for biofuel production, comprises completely or partially inhibiting the expression and/or the activity of an enzyme S-ribonuclease binding protein 1 (SBP1), of which the polypeptide sequence has at least 75% of identity with SEQ ID NO: 3, where the sequences not defined here may be found at ftp://ftp.wipo.int/pub/published pct sequences/publication.    USE - The process is useful for improving digestibility and ingestibility of the plant, where the plant is maize; for the preparation of the corn, for the preparation of a composition for animal feed or preparation of biofuels (all claimed). Test details are described but no results given.    ADVANTAGE - The process provides corn with good yields and are insensitive to various stresses (mechanical, water, and biotic).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) the use of at least one polynucleotide comprising (a) a polynucleotide encoding the SBP1 enzyme, (b) a polynucleotide complementary to the polynucleotide, (c) a fragment of at least 12 consecutive nucleotides, of the polynucleotide (a) or (b), or a fragment capable of hybridizing selectively with the polynucleotide, (d) a polynucleotide allowing the production of a duplex for RNA interference (RNAi), a polynucleotide containing a polynucleotide X containing at least 12 nucleotides, preferably at least 50 nucleotides capable of hybridizing selectively with a polynucleotide (a) and a polynucleotide Y complementary of the polynucleotide X for the implementation of the process;    (2) an expression cassette comprising the polynucleotide, under the transcriptional control of a suitable promoter;    (3) a recombinant vector containing the expression cassette; a corn obtained by the process and having a mutation in the gene coding for the SBP1 enzyme of which the sequence has at least 75% of identity with SEQ ID NO: 2, where the mutation results in an inhibition of the expression and/or activity of SBP1, and the sequences not defined here may be found at ftp://ftp.wipo.int/pub/published pct sequences/publication;    (4) genetically modified corn, obtained by the process;    (5) a process for selecting corn, comprising researching of one allele of the gene for the enzyme SBP1 having a mutation resulting into an improvement of the digestibility of the corn;    (6) a method for obtaining corn having increased digestibility, comprising introgression of the L sbp-1 allele in the corn, comprising (a) crossing a first line of corn having L sbp-1 allele with a second corn not having the allele, (b) carrying out genotyping of obtained offspring and selecting the descendants having L sbp-1 allele, and optionally having the best genome ratio for second maize, (c) carrying out a backcrossing of offsprings with the second line of elite corn used for the production of hybrids, (d) optionally repeating the steps (b) and (c) to obtain isogenic line of the second corn, having L sbp-1 allele, and (e) optionally, carrying out a self-fertilization to obtain a homozygous plant for L sbp-1 allele;    (7) a method for preparing a composition for animal food comprising silaging of the corn obtained by the process or derivative of the corn; and    (8) a method for the preparation of biofuels, comprising degradation of the corn obtained by the process or derivative of the corn.