Abstract
Tea saponin (TS), a representative tea seed-derived biosurfactant, was effective in promoting the uptake of Cd from soil by corn (Zea Mays L.). The concentration of Cd in roots increased with the growth of corn, while for shoots, concentration of Cd increased rapidly at the beginning and reached the maximum in a short period and then gradually decreased against the uptake time. Over a 5 day growth period, Cd concentration was 116.9 mg/kg in roots and 104.19 mg/kg in shoots which were both about 1.6 times as that without TS. In addition, the accumulated Cd in corn was greatly influenced by TS concentrations in shoots and roots, the Cd contents in corn shoots and roots increased with the increasing concentrations of TS added in soil. The higher Cd accumulation in the roots and shoots indicated that TS had the potential in enhancing the uptake of Cd into corn in the concentration ranged 25-200 mg/kg.
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