State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China; Agricultural Quality Standards and Testing Institute, Tibet Academy of Agricultural and Animal Husbandry Sciences, Tibet, 850000, PR China.
Chemosphere. 2024 Aug;362:142510. doi: 10.1016/j.chemosphere.2024.142510. Epub 2024 Jun 20.
Ligusticum Chuanxiong is an essential medicinal and edible plant, but it is highly susceptible to the enrichment of soil Cadmium (Cd), which seriously affects its medical safety. However, the control of Cd uptake by Ligusticum Chuanxiong is little reported. In this study, we reported that a green Mercapto-functionalized palygorskite (MPAL) effectively promoted Ligusticum Chuanxiong growth, and restrained the Cd uptake by Ligusticum Chuanxiong both in the mildly contaminated soil (M-Soil) and severely contaminated soil (S-Soil). The experimental results demonstrated that the application of MPAL significantly increased the biomass and antioxidant enzyme activity of Ligusticum Chuanxiong. In the M-Soil, the Cd content in the roots, stems, and leaves of Ligusticum Chuanxiong decreased markedly by 82.46-86.66%, 64.17-71.73%, and 64.94-76.66%, respectively, after the MPAL treatment. In the S-Soil, MPAL application decreased the Cd content in roots, stems, and leaves by 89.43-98.92%, 24.19-86.22%, and 67.14-77.90%, respectively. Based on Diethylenetriamine Pentaacetic Acid (DTPA) extraction, the immobilization efficiency of MPAL for Cd in soils ranged from 22.01% to 77.04%. Additionally, the HOAc extractable Cd was transformed into reducible and oxidizable fractions. Furthermore, MPAL enhanced the activities of soil alkaline phosphatase, and urease, but decreased sucrase activity. Environmental toxicological analysis indicated that MPAL reduced the potential ecological risk of Cd in the soil. These findings revealed that MPAL can effectively reduce Cd accumulation in Ligusticum Chuanxiong and promote plant growth, suggesting its potential as a viable amendment for remediating Cd-contaminated soils.
川芎是一种重要的药用和食用植物，但它极易受到土壤镉（Cd）的富集，这严重影响了其药用安全性。然而，对川芎吸收 Cd 的控制报道甚少。在本研究中，我们报道了一种绿色巯基功能化坡缕石（MPAL）可有效促进川芎生长，并抑制川芎在轻度污染土壤（M-土壤）和重度污染土壤（S-土壤）中对 Cd 的吸收。实验结果表明，MPAL 的应用显著增加了川芎的生物量和抗氧化酶活性。在 M-土壤中，MPAL 处理后，川芎的根、茎和叶中的 Cd 含量分别显著降低了 82.46-86.66%、64.17-71.73%和 64.94-76.66%。在 S-土壤中，MPAL 处理后，根、茎和叶中的 Cd 含量分别降低了 89.43-98.92%、24.19-86.22%和 67.14-77.90%。基于二乙三胺五乙酸（DTPA）提取法，MPAL 对土壤中 Cd 的固定效率在 22.01%-77.04%之间。此外，HOAc 可提取的 Cd 转化为可还原和可氧化的部分。此外，MPAL 增强了土壤碱性磷酸酶和脲酶的活性，但降低了蔗糖酶的活性。环境毒理学分析表明，MPAL 降低了土壤中 Cd 的潜在生态风险。这些发现表明，MPAL 可有效降低川芎对 Cd 的积累，促进植物生长，表明其作为修复 Cd 污染土壤的可行改良剂具有潜力。
