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The in vivo changes in the growth and in the biosynthesis of cell wall polysaccharides (pectins, hemicelluloses and α-cellulose) were studied in apical and subapical root segments isolated from water stressed and unstressed wheat seedlings (Triticum durum Desf.) cv. Capeiti 'drought tolerant' and cv. Creso 'drought sensitive'. In both cultivars, water stress imposed by a 20% solution of polyethylene...