Figure 1

Effect of Al³⁺on root elongation, citrate exudation and Al content in roots of J. A17 and R108 plants. The relative root elongation was determined by exposing 3-d-old seedlings of J. 17 and R108 to 5 μM AlCl₃ (pH 4.5) for 2 days (a). Data are mean ± s.e. with n = 10. Al contents in roots of J. A17 and R108 plants before and after exposure to 5 μM AlCl₃ (pH 4.5) for 2 days (b). Data are mean ± s.e. with n = 4. Citrate exudation rate from roots of J. A17 and R108 plants treated with 5 μM AlCl₃ (pH 4.5) for 24 h (c). Data are mean ± s.e. with n = 5. * and ** indicate significant difference between genotypes within a given growth condition (−Al or + Al) at P ≤ 0.05 and P ≤ 0.01, respectively.