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Fig. S1 Effect of Al on wheat (Triticum aestivum) root elongation and NO production of CaCl2 and 1/8 Hoagland's solution precultivated seedlings.

Fig. S2 Accumulation of Al in root apexes in Al-resistant and Al-sensitive wheat (Triticum aestivum) genotypes at the indicated time after Al exposure.

Fig. S3 Root elongation and NO generation in wheat (Triticum aestivum) seedlings under LaCl3, YbCl3 and CdCl2 treatments.