School of Environmental and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China.
Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou, 215009, China.
Environ Sci Pollut Res Int. 2022 Aug;29(37):56750-56759. doi: 10.1007/s11356-022-19879-4. Epub 2022 Mar 26.
The application of biodegradable chelating agents to enhance phytoremediation is a low-cost and promising method to improve the remediation efficiency of heavy metal-contaminated soil. The effects of N, N-bis glutamic acid (GLDA) on the growth and heavy metal absorption of Solanum nigrum were studied by pot experiment. The addition of chelate on the 20th day after sowing can improve the bioavailability of cadmium (Cd) in the soil. The results showed that the addition of chelating agents effectively improved the migration rate of the target heavy metal Cd in the soil, and significantly increased the accumulation of heavy metal in the roots, stems, and leaves of plants. The results showed that compared with the control group, the chelating agent could increase the extraction rate of total Cd by 28.65-68.74%. The application of GLDA significantly increased the accumulation of Cd (20 mg kg and 40 mg kg), reaching 24.28-40.30 and 25.71-33.16 μg of pot DW, respectively. At the same time, GLDA increased Cd stress by decreasing plant biomass, inhibiting photosynthetic pigment synthesis and increasing MDA levels. These results indicated that GLDA could improve the absorption of Cd by S. nigrum, which provided a new idea for its practical application in the remediation of Cd-contaminated soil.
应用可生物降解的螯合剂来增强植物修复是一种提高重金属污染土壤修复效率的低成本、有前景的方法。通过盆栽实验研究了 N,N-双谷氨酸(GLDA)对龙葵生长和重金属吸收的影响。螯合剂在播种后第 20 天添加可以提高土壤中镉(Cd)的生物有效性。结果表明，添加螯合剂能有效提高目标重金属 Cd 在土壤中的迁移率，并显著增加植物根、茎和叶中重金属的积累。结果表明，与对照组相比，螯合剂可将总 Cd 的提取率提高 28.65-68.74%。GLDA 的应用显著增加了 Cd 的积累（20mg/kg 和 40mg/kg），达到 24.28-40.30 和 25.71-33.16μg 盆栽干重，分别。同时，GLDA 通过降低植物生物量、抑制光合色素合成和增加 MDA 水平来增加 Cd 胁迫。这些结果表明，GLDA 可以提高龙葵对 Cd 的吸收，为其在修复 Cd 污染土壤中的实际应用提供了新的思路。
