Abstract
Ten Triticum aestivum and two Triticum turgidum conv. durum genotypes differing in Zn efficiency were grown in chelate-buffered nutrient solution at Zn supplies ranging from deficient to sufficient (free Zn activities from 2 to 200 pM, pZn from 11.7 to 9.7). Correlation between the rate of Zn uptake and the Zn efficiency ranking was poor. Uptake of Zn by all genotypes increased linearly with an increase in solution Zn activities, with a slight saturation apparent at 200 pM. Relative amounts of Zn and Fe transported to shoots increased with duration of growth and at higher supply of Zn. With an increase in solution Zn activities, uptake rates of Fe, Mn and Cu dropped in Zn-efficient genotypes and increased in Zn-inefficient ones. While shoot concentrations of Fe did not differ between Zn-efficient and inefficient genotypes at ≥10 pM Zn activity, root Fe concentrations were around 3-fold higher in Zn-efficient genotypes at 2 pM Zn activity. All genotypes accumulated high amounts of P in shoots after 22 d of growth at deficient Zn supply. It is concluded that nutrient interactions, especially at deficient Zn supply, may be influential in determining the level of Zn efficiency of wheat genotypes.
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