Azab Ehab, Hegazy Ahmad K
Biotechnology Department, Faculty of Science, Taif University, Taif 21974, Saudi Arabia.
Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Sharkia, Egypt.
Plants (Basel). 2020 Aug 19;9(9):1057. doi: 10.3390/plants9091057.
Heavy metal-contaminated soil constitutes many environmental concerns. The toxic nature of heavy metals poses serious threats to human health and the ecosystem. Decontamination of the polluted soil by phytoremediation is of fundamental importance. Vegetation is an appealing and cost-effective green technology for the large-scale phytoremediation of polluted soils. In this paper, a greenhouse experiment was carried out to test the potential of as a heavy metal phytoremediator in polluted soil. Plants were grown for three months in pots filled with soils treated with the heavy metals Cd, Pb, Cu, and Zn at rates of 10, 50, and 100 mg/kg. The bioaccumulation factor (BCF) and translocation factor (TF) were calculated to detect the ability of to accumulate and transfer heavy metals from soil to plant organs. The results showed that under increasing levels of soil pollution, the bioconcentration of Cd and Zn heavy metals showed the highest values in plant roots followed by leaves, whereas in the case of Pb and Cu, roots showed the highest values followed by stems. Heavy metals accumulation was higher in roots than in stems and leaves. The BCF of Zn reached the highest values in roots and stems for 10 mg/kg soil treatment, followed by the BCFs of Cd, Cu, and Pb. The TF for the different heavy metal pollutants' concentrations was less than unity, suggesting that the plants remediate pollutants by phytostabilization. The TF values ranged from higher to lower were in the order Zn > Cu > Cd > Pb. The rapid growth of and its tolerance of heavy metals, as well as its ability to absorb and accumulate metals within the plant, recommends its use in the phytoremediation of slightly polluted soils in arid lands by limiting the heavy metals transport.
重金属污染土壤引发了诸多环境问题。重金属的毒性对人类健康和生态系统构成了严重威胁。通过植物修复对污染土壤进行净化至关重要。植被是一种用于大规模植物修复污染土壤的有吸引力且经济高效的绿色技术。本文开展了一项温室实验，以测试[植物名称未给出]作为污染土壤中重金属植物修复剂的潜力。将植物种植在装有以10、50和100毫克/千克的速率添加重金属镉、铅、铜和锌处理过的土壤的花盆中三个月。计算生物累积系数（BCF）和转运系数（TF），以检测[植物名称未给出]从土壤中积累和向植物器官转运重金属的能力。结果表明，随着土壤污染水平的增加，镉和锌重金属在植物根部的生物富集量最高，其次是叶片，而对于铅和铜，根部的含量最高，其次是茎部。重金属在根部的积累高于茎部和叶片。对于10毫克/千克土壤处理，锌的BCF在根部和茎部达到最高值，其次是镉、铜和铅的BCF。不同重金属污染物浓度下的TF小于1，表明植物通过植物稳定作用修复污染物。TF值从高到低的顺序为锌>铜>镉>铅。[植物名称未给出]的快速生长及其对重金属的耐受性，以及其在植物体内吸收和积累金属的能力，表明通过限制重金属迁移，它可用于干旱地区轻度污染土壤的植物修复。
