Twenty three durum wheat inbred lines were evaluated with four bread wheat cultivars (IAC-24, BH-1146, Siete Cerros and IAC-60) in three experiments, using nutrient solutions. In the first experiment, the following levels of Al3+ were used: 0; 0.2; 0.4; 0.6; 0.8 and 1.0 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 1.200 mg/L. The wheat cultivars Siete Cerros (sensitive to Al3+ toxicity) and BH-1146, IAC-24 and IAC-60 (tolerant to Al3+ toxicity) exhibited root growth in the presence of 1 mg/L of Al3+, and all evaluated durum wheat inbred lines were sensitive to 0.4 mg/L of Al3+, showing an irreversible root growth. As the Mn2+ and Fe2+ concentrations were increasead into the solutions, the root length of all studied genotypes presented a significant reduction. The durum wheat inbred lines 1 (Avetoro "S" x Anhinga "S" - Purcell "S"/ D.67.2), 2 (Cando - Yavaros "S"), 6 (Chen "S") e 8 (Carcomum "S") showed high level of tolerance to manganese toxicity in relation to 'Siete Cerros' and the durum wheat inbred lines 1, 6, 12 (CI 14955 x Yavaros "S"- Gediz"S"/Tropic Bird), 16 and 21 (Swan 'S") and 20 (Boyeros "S"/Cocorit-71/5/Crane/Ganso//Marte"S"/3/TiIdillo"S"/4/Memo "S") exhibited tolerance to the presence of high levels of Fe2+ into the nutrient solutions.
durum wheat; Triticum durum L.; bread wheat; T. aestivum L.; inbred lines; cultivars; root length; aluminum; manganese and iron toxicities; tolerance; sensitivity