Figure 4.

Free amino acids, proline and soluble sugars concentrations of rice plants in response to Al treatment. Total free amino acids (A) in the 2nd and 3rd youngest leaves, proline (B) and soluble sugar (C) in leaves of rice plant cultivars Cotaxtla, Tres Ríos, Huimanguillo, and Temporalero grown in the absence (−) or presence of 200 μM Al (+) for 20 days. Values are means ± SE from five individual plants. Different letters above the column indicate significant differences (Tukey, P ≤ 0.05). FBW, fresh biomass weight; DBW, dry biomass weight.