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Efetuaram-se cruzamentos entre o cultivar BH-1146, de porte alto, tolerante à toxicidade de alumínio e sensível à toxicidade de ferro e manganês, e o cultivar Siete Cerros, de porte semi-anão, sensível à toxicidade de alumínio, porém com tolerância à toxicidade de ferro e manganês. Selecionaram-se plântulas desse cruzamento, em geração F2, quanto à tolerância ao alumínio (10mg/litro), empregando-se soluções nutritivas, e plantaram-nas em vasos no telado contra o ataque de pássaros. A partir da geração F3 até F6, selecionaram-se plântulas em soluções nutritivas distintas contendo 6mg/litro de Al3+, 600mg/litro de Mn2+ e 10mg/litro de Fe2+. Avaliaram-se as vinte e três linhagens obtidas - doze de porte semi-anão e onze de porte alto juntamente com os cultivares BH-1146 e Siete Cerros em três experimentos, empregando-se soluções nutritivas. No primeiro, utilizaram-se os níveis de 0, 2, 4, 6, 8 e 10mg/litro de Al3+; no segundo, 0,11; 300; 600 e 1.200mg/litro de Mn2+ e no terceiro, 0,56; 5; 10 e 20mg/litro de Fe2+. Os resultados obtidos permitiram confirmar que as vinte e três linhagens selecionadas apresentaram, ao mesmo tempo, tolerância à toxicidade de Al3+, Mn2+ e Fe2+. Crosses were made between BH-1146, a tall wheat standard cultivar and tolerant to toxic effects of aluminum and sensitive to iron and manganese excessive levels, and Siete Cerros, a semidwarf cultivar and sensitive to aluminum and tolerant to iron and manganese toxic effects. Seedlings of this cross, in F2 generation, were selected for aluminum tolerance (10 mg/l) using nutrient solutions. Tolerant plants were transplanted to pots into a screenhouse. Selections of tolerant plants for aluminum, iron and manganese were made from F3 to F6 generations using distinct nutrient solutions with 6 mg/l of Al3+, 600 mg/l of Mn2+ and 10 mg/l of Fe2+. Twenty three inbred lines were obtained and evaluated with the cultivars BH-1146 and Siete Cerros in three experiments, using nutrient solutions. In the first experiment, the following levels of Al3+ were used: 0, 2, 4, 6, 8 and 10 mg/l; in the second experiment, the following levels of Mn2+ were used: 0.11; 300; 600 and 1,200 mg/l; and in the third experiment, Fe2+ was used at: 0.56; 5; 10 and 20 mg/l. The results permitted to confirm that selected inbred lines presented simultaneous tolerance to aluminum, manganese and iron toxicities

Melhoramento do trigo: XXVI. Avaliação de linhagens com tolerância à toxicidade de alumínio, manganês e ferro em soluções nutritivas