Mahmood-Ul-Hassan Muhammad, Suthar Vishandas, Ahmad Rizwan, Yousra Munazza
Land Resources Research Institute, National Agricultural Research Centre, Islamabad, 45500, Pakistan.
Central Cotton Research Institute, Sakrand, Pakistan.
Environ Monit Assess. 2017 Oct 30;189(11):591. doi: 10.1007/s10661-017-6302-y.
The abilities of sorghum (Sorghum bicolor L.) and oat (Avena sativa L.) to take up heavy metals from soils amended with ethylenediaminetetraacetic acid (EDTA) were assessed under greenhouse conditions. Both plants were grown in two soils contaminated with heavy metals (Gujranwala-silty loam and Pacca-clay loam). The soils were treated with 0, 0.625, 1.25, and 2.5 mM EDTA kg soil applied at both 45 and 60 days after sowing (DAS); the experiment was terminated at 75 DAS. Addition of EDTA significantly increased concentrations of Cd, Cr, and Pb in roots and shoots, and bio-concentration factors and phytoextraction rates were also increased. Post-harvest soil analysis showed that soluble fractions of metals were also increased significantly. The increase in Cd was ≈ 3-fold and Pb was ≈ 15-fold at the highest addition of EDTA in Gujranwala soil; in the Pacca soil, the increase was less. Similarly, other phytoremediation factors, such as metal translocation, bio-concentration factor, and phytoextraction, efficiency were also maximum when soils were treated with 2.5 mM EDTA kg soil. The study demonstrated that sorghum was better than oat for phytoremediation.
在温室条件下评估了高粱（Sorghum bicolor L.）和燕麦（Avena sativa L.）从添加乙二胺四乙酸（EDTA）的土壤中吸收重金属的能力。两种植物都种植在两种受重金属污染的土壤中（古吉兰瓦拉粉质壤土和帕卡粘壤土）。在播种后45天和60天（DAS），对土壤分别施加0、0.625、1.25和2.5 mM EDTA kg土壤；实验在75 DAS时终止。添加EDTA显著增加了根和地上部中镉、铬和铅的浓度，生物富集系数和植物提取率也有所提高。收获后土壤分析表明，金属的可溶部分也显著增加。在古吉兰瓦拉土壤中，添加最高剂量的EDTA时，镉的增加约为3倍，铅的增加约为15倍；在帕卡土壤中，增加幅度较小。同样，当土壤用2.5 mM EDTA kg土壤处理时，其他植物修复因子，如金属转运、生物富集系数和植物提取效率也最高。研究表明，在植物修复方面高粱比燕麦更具优势。
