Abstract

The effect of different doses of Cd on the uptake and distribution of micronutrients in several species of Lactuca, (Lactuca sativa cv. Winter yellow; Lactuca serriola cv. Hortelano; Lactuca serriola cv. Pancalieri), two cultivars of Zea mays (cvs. Dakalb XL 72 AA and Dekalb Paolo) and two cultivars of Pisum sativum (cvs. Argona and Waverplus) is studied. Plants exposed to Cd concentrations ranging from 0.1 to 15 mg Cd 1-1 showed more accumulation of Cd in root than in shoot (from 7 to 15 times higher in root). Growth and visual symptoms showed that Pisum cultivars were those affected the most. The content of Mn in plant tissues was reduced consistently under Cd treatments. Moreover, the relative concentration of Mn was higher in shoot than in root, which indicates a sort of redistribution among tissues. Fe uptake was also reduced or not by the exposure to Cd in the nutrient solution depending on the species. Moreover, the analysis of other micronutrients (Cu and Zn) revealed that no consistent alteration in their content was achieved.

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