Department of Environmental Sciences and Engineering, Government College University, Faisalabad, 38000, Pakistan.
Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, 38000, Pakistan.
Ecotoxicol Environ Saf. 2019 May 30;173:273-284. doi: 10.1016/j.ecoenv.2019.01.119. Epub 2019 Feb 15.
Past studies have thoroughly explored the phytoextraction/phytostabilization potentials of different plant species for particular metals. However, none of the plants was able to tackle the problem of multi-metal in contaminated soils. We report herewith the potential of Conocarpus erectus to extract lead (Pb) while having the capability to stabilize chromium (Cr), nickel (Ni) and cadmium (Cd) in polluted soil. The C. erectus was subjected to grow for 120 days in a soil spiked with four different levels of each metal i.e. Pb (0, 600, 1200 and 2400 mg kg), Ni (0, 50, 100 and 200 mg kg), Cr (0, 150, 300 and 600 mg kg) and Cd (0, 20, 40 and 80 mg kg). Data related to plant growth, physiology, biochemistry and antioxidants activities revealed that forenamed parameters were significantly reduced with increasing spiking levels. Contrarily, metal speciation in plant parts (metal concentrations in shoots and roots, and metal contents in these corresponding plant parts), metal removal per pot, and DTPA-extractable metals from the soil were significantly increased with increasing spiking level upon the termination of the experiment. Curiously, each spiking level demonstrated elevated Pb concentrations in shoots than roots, while the concentrations of other metals (Cr, Ni, and Cd) were found higher in roots than in the shoots. Likewise, at each spiking level, C. erectus showed both bioconcentration factor (BCF) and translocation factor (TF) values greater than 1 for Pb, while these values were ever lower than 1 for Cr, Ni, and Cd. Moreover, the percentages of Pb removal were ever higher than other metals at each spiking level. Outcomes of our experiment suggest that C. erectus has immense potential for the phytoextraction of Pb and phytostabilization of Cr, Ni, and Cd in polluted soil. It is suggested that this plant can be used to tackle the problem of multi-metal pollution in soils.
过去的研究已经彻底探讨了不同植物物种对特定金属的植物提取/植物稳定潜力。然而，没有一种植物能够解决污染土壤中多金属的问题。我们在此报告了海红豆（Conocarpus erectus）提取铅（Pb）的潜力，同时具有稳定污染土壤中铬（Cr）、镍（Ni）和镉（Cd）的能力。将海红豆种植在添加了四种不同浓度的每种金属的土壤中，即 Pb（0、600、1200 和 2400mg/kg）、Ni（0、50、100 和 200mg/kg）、Cr（0、150、300 和 600mg/kg）和 Cd（0、20、40 和 80mg/kg），共 120 天。与植物生长、生理、生化和抗氧化剂活性相关的数据表明，上述参数随着添加水平的增加而显著降低。相反，随着实验结束时每个添加水平的增加，植物各部分的金属形态（茎叶中的金属浓度和金属含量，以及这些相应植物部分中的金属含量）、每盆的金属去除量以及土壤中 DTPA 可提取的金属量均显著增加。有趣的是，每个添加水平均显示出茎叶中的 Pb 浓度高于根系，而其他金属（Cr、Ni 和 Cd）的浓度则高于根系。同样，在每个添加水平下，海红豆对 Pb 的生物浓缩因子（BCF）和转移因子（TF）值均大于 1，而这些值对 Cr、Ni 和 Cd 的值均小于 1。此外，在每个添加水平下，Pb 的去除百分比均高于其他金属。我们的实验结果表明，海红豆在污染土壤中具有提取 Pb 和稳定 Cr、Ni 和 Cd 的巨大潜力。建议使用这种植物来解决土壤中多金属污染的问题。
