Campus Olezio Galotti - Três Poços, Centro Universitário de Volta Redonda (UniFOA), Volta Redonda, Brazil.
Campus Pinheiral, Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (IFRJ), Pinheiral, Brazil.
Int J Phytoremediation. 2020;22(10):1019-1027. doi: 10.1080/15226514.2020.1725868. Epub 2020 Feb 17.
Two greenhouse experiments were carried out to evaluate the phytoremediation potential, physiological responses and zinc (Zn) uptake kinetics of water lettuce ( L.). The phytoextraction experiment evaluated four doses of Zn (0.7 mg L - represented the Zn in the nutrient solution, 1.8, 18 and 180 mg L - 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). The water lettuce attained the highest percentage removal at the lowest evaluated doses (0.7 and 1.8 mg L), reaching a maximum value of approximately 72% removal (when cultivated in 1.8 mg L 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.
进行了两项温室实验，以评估水蕹菜（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 Zn 的四个剂量（0.7mg L-代表营养溶液中的 Zn，1.8、18 和 180mg L-分别对应于淡水最大允许含量的十倍、百倍和千倍），在四个不同的培养时间（24、48、72 和 168 小时）。水蕹菜的 Zn 吸收动力学在两个 Zn 浓度（1.8 和 18mg L-）下进行评估。水蕹菜在最低评估剂量（0.7 和 1.8mg L-）下达到最高去除百分比，在培养 168 小时后在 1.8mg L-的 Zn 中达到约 72%的最大去除值。Zn 吸收随培养时间而增加，在所有评估剂量下增加类胡萝卜素的合成。最高剂量的 Zn 导致光合效率降低。结果表明，水蕹菜具有吸收和耐受 Zn 的巨大潜力，优先在根部积累，表明这些植物能够在受污染的溶液中吸收大量的 Zn。
