Cadmium Uptake and Distribution in Tolerant and Non-Tolerant Populations of Holcus lanatus Grown in Solution Culture

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Abstract
Cd uptake and distribution between roots and shoots of a tolerant and a non-tolerant population of H. lanatus were studied with reference to both concentration and total Cd content. The uptake of Cd into roots of both normal and tolerant plants from nutrient solutions containing 1 ppm Cd is extensive and in normal plants as much as 90% of the whole plant Cd remains in the roots but translocation allows shoot concentrations to reach 145 ppm. In tolerant plants translocation of Cd to shoots is further reduced with a concomitant increase of Cd concentration in the roots. These effects are due to differences in biomass and metal uptake of the 2 populations.