Heran？a da tolerancia à toxicidade de alumínio em trigo duro

durum wheat (triticum durum desf.), also known as "pasta wheat", is characterized to produce yellow flour (semolina) adequate for pasta elaboration. in brazil, its extensive cultivation is limited by the low crop adaptability to acid soils, with toxic aluminum levels. aiming to estimate the inheritance of the aluminum toxicity tolerance, crosses were made between tolerant durum wheat genotype p33 and the sensitive iac-1003 to obtain the hybrid in f1 generation and subsequent generations f2, f3, bc1f1, bc2f1, bc1f2 and bc2f2. all genotypes were tested in nutrient solutions and the aluminum toxicity tolerance was measured by the growth capacity of the primary central root after 48 hours of treatment with 2 mg l-1 of aluminum in nutrient solution. the genotype p33 has differed from iac-1003 by one pair of dominant alleles for the tolerance at the presence of this aluminum concentration in the nutrient solution and it could be used as source of aluminum tolerance in durum wheat breeding programs.