Phytoextraction of Cd, Ni, and Pb Using Four Willow Clones (Salix spp.)

摘要

In order to determine their phytoextraction potential, four clones of Salix (1. Salix alba - clone 68/53/1; 2. Salix alba - clone 106/54/0; 3. Salix matsudana - clone SM 4041; and 4. Salix nigra -clone 0408) were exposed to elevated concentrations of Cd, Ni and Pb-EDTA in a water culture solution. The translocation ratio to upper plant parts was very low for all applied heavy metals and, therefore, the metal uptake was restricted to the roots, especially regarding Pb. The ability of the clones to extract and translocate Cd, Ni and Pb differed depending on the quantity of metal content in the nutrient solution and of the willow genotype. The ability of the investigated clones to accumulate Cd in leaves is to our knowledge among the highest so far recorded compared to other hydroponic trials in literature. The preference for Cd-stimulated root growth was determined. This genotype-specific response could be part of a mechanism for Cd resistance.