Induction of Aluminum Tolerance in Wheat Seedlings by Low Doses of Aluminum in the Nutrient Solution

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Abstract
Preincubation of wheat (T. aestivum L. Thell.) seedlings in a nutrient solution containing low doses of Al (0.5 Mg/ml for tolerant cv. Atlas 66 and 0.1 Mg/ml for the sensitive cv. Grana) enabled substantial root regrowth of varieties grown in a lethal Al concentration, despite an increased accumulation of Al in root tissue of the pretreated seedlings. The distribution of Al in the subcellular fractions remained unchanged. The increase in tolerance was completely abolished by the addition of cycloheximide. Al ions at sublethal concentrations significantly increased the incorporation of [14C]valine and 3H-thymidine in roots. The possible role of the synthesis of the inducible Al binding protein in the mechanism of Al tolerance is discussed.