Environmental Science and Engineering PhD Program, University of Texas at El Paso, 500 West University Ave., El Paso, TX 79968, USA.
Arch Environ Contam Toxicol. 2013 Aug;65(2):212-23. doi: 10.1007/s00244-013-9904-6. Epub 2013 Apr 24.
Due to health reasons, toxic metals must be removed from soils contaminated by mine tailings and smelter activities. The phytoremediation potential of Prosopis pubescens (screw bean mesquite) was examined by use of inductively-coupled plasma optical emission spectroscopy. Transmission electron microscopy was used to observe ultrastructural changes of parenchymal cells of leaves in the presence of copper. Elemental analysis was used to localize copper within leaves. A 600-ppm copper sulfate exposure to seedlings for 24 days resulted in 31,000 ppm copper in roots, 17,000 ppm in stems, 11,000 in cotyledons and 20 ppm in the true leaves. For a plant to be considered a hyperaccumulator, the plant must accumulate a leaf-to-root ratio <1. Screw bean mesquite exposed to copper had a leaf-to-root ratio of 0.355 when cotyledons were included. We showed that P. pubescens grown in soil is a hyperaccumulator of copper. We recommend that this plant should be field tested.
由于健康原因，必须从受矿山尾矿和冶炼厂活动污染的土壤中去除有毒金属。本文使用电感耦合等离子体发射光谱法研究了 短叶黄耆（豆科槐属）的植物修复潜力。透射电子显微镜用于观察铜存在时叶片实质细胞的超微结构变化。元素分析用于定位叶片内的铜。将幼苗在 600ppm 硫酸铜中暴露 24 天，导致根部铜含量为 31000ppm，茎部铜含量为 17000ppm，子叶铜含量为 11000ppm，真叶铜含量为 20ppm。要将植物视为超积累植物，植物必须积累叶根比<1。当包括子叶时，暴露于铜的短叶黄耆的叶根比为 0.355。我们表明，在土壤中生长的 短叶黄耆是铜的超积累植物。我们建议对这种植物进行田间试验。
