The present invention relates to the specific silencing of the α (alpha), β (beta), γ (gamma) and ω (omega)-gliadins of hard wheat for flour by RNA interference (RNAi) through employment of a polynucleotide which is transcribed into an hpRNA (hairpin RNA). Furthermore the present invention additionally relates to a vector, cell, plant or seed comprising the polynucleotide, the expression whereof is specifically directed in particular tissues of wheat seeds through gene expression-regulating sequences such as, for example, the promoter of a gene of γ-gliadins or the promoter of the gene encoding for a D-hordein.
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