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The aim was to evaluate the influence of (i) cations potentially present in soil solution and (ii) of plant Cd content on apoplastic and symplastic root uptake of Cd. Hydroponically grown maize (Zea mays) roots were exposed to two Cd concentrations together with a cation five times the strength of the Cd. The influence of three pH and four Ca levels was also assessed. In addition, maize and alpine penny-cress (Noccaea caerulescens) were grown so their tissues contained Cd at three levels when their roots were exposed for 1h to three Cd concentrations. Maize Cd uptake in the 5μM Cd solution was reduced by the presence of Pb²⁺, Cu²⁺, Co²⁺, Zn²⁺, Mg²⁺ or Mn²⁺. At a 1μM Cd concentration, Cu²⁺, as well as Ca²⁺ and H⁺ reduced the Cd uptake. However, the Ca concentration had to be much higher than that of Cd to restrain its uptake. High plant Cd content was responsible for an increase in the apoplastic Cd …