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Relationship between root citrate exudation and root Al content. Al content values were estimated as in Figure 2A. Citrate exudation rates correspond to those shown in Table I. Horizontal and vertical bars indicate the SEM. The numbers refer to the different maize genotypes in order of decreasing Al resistance: highly Al-resistant Cateto-Colombia (no. 1), moderately Al-resistant Pioneer (no. 2), and Al-sensitive Mo17 (no. 3), B73 (no. 4), L53 (no. 5), and 11 × 723 (no. 6).
