TOXIDEZ POR ALUMÍNIO E HIDROGÊNIO NO CRESCIMENTO DE RAÍZES DE MILHO

With the objective of investigating differential tolerance of maize inbred lines to aluminum (Al) and its interaction with high proton activity, in nutritive solution, two experiments were carried out in green houses. In the first experiment, six maize inbred lines from EMBRAPAs breeding program were evaluated in four different Al concentrations (0, 55, 111 and 222 µM) and in the second experiment, the same lines were evaluated in nutritive solution with four different pH values (3.8, 4.2, 4.6 and 5.0). During transplant and five days of treatment, seminal root length was measured for all treatments. From the inbred lines evaluated, four were Al tolerant (Cateto Al 237, SLP 181, L 1154, L3) and two were sensitive (L 53 and L 36). There was no defined correlation between Al tolerance and tolerance to high proton activity in nutritive solution. The tolerance characteristic was better evaluated in the concentration of 222 µM of Al, suggesting