Two greenhouse experiments were carried out to evaluate the phytoremediation potential, physiological responses and zinc (Zn) uptake kinetics of water lettuce (Pistia stratiotes L.). The phytoextraction experiment evaluated four doses of Zn (0.7 mg L⁻¹ – represented the Zn in the nutrient solution, 1.8, 18 and 180 mg L⁻¹ – corresponded to ten, hundred and a thousand times, respectively, the maximum permitted content for fresh water) at four different culture times (24, 48, 72 and 168 h). The Zn uptake kinetics of water lettuce were evaluated at two concentrations of Zn (1.8 and 18 mg L⁻¹). The water lettuce attained the highest percentage removal at the lowest evaluated doses (0.7 and 1.8 mg L⁻¹), reaching a maximum value of approximately 72% removal (when cultivated in 1.8 mg L⁻¹ of Zn after 168 h of culture). The Zn uptake increased with culture time, increasing the synthesis of carotenoids at all doses evaluated. The highest doses of Zn resulted in a reduction in photosynthetic efficiency. The results showed a high potential of water lettuce to absorb and tolerate Zn, accumulating preferably in the roots, demonstrating that these plants are able to absorb large quantities of Zn in contaminated solution.

进行了两个温室实验，以评估莴苣（Pistia stratiotes L.）的植物修复潜力，生理响应和锌（Zn）吸收动力学。植物提取实验评估了四剂锌（0.7 mg L ^-1 –代表营养液中的锌，1.8、18和180 mg L ^-1 –分别对应于十倍，一百倍和一千倍），最大允许含量为淡水）在四个不同的培养时间（24、48、72和168小时）。在两种浓度的锌（1.8和18 mg L ^-1）下评估了莴苣的Zn吸收动力学。在最低的评估剂量下（0.7和1.8 mg L ^-1）水莴苣的去除率最高），达到约72％去除的最大值（当在168小时培养后在1.8 mg L ^-1的Zn中培养时）。锌的吸收随培养时间的增加而增加，在所有评估剂量下，类胡萝卜素的合成均增加。最高剂量的锌导致光合作用效率降低。结果表明，莴苣具有很高的吸收和忍受锌的潜力，最好是在根部积累，表明这些植物能够吸收被污染溶液中的大量锌。