School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, China; School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
Sci Total Environ. 2024 Nov 25;953:175990. doi: 10.1016/j.scitotenv.2024.175990. Epub 2024 Sep 6.
The rare earth element lanthanum (La(III)) has been found to effectively enhance crop yields and improve plant growth and development. Arsenic (As), as a class of toxic metals widely found in the environment, poses a serious threat to both ecological and human health. Research on the application of La(III) in phytoremediation to enhance remediation efficiency is currently lacking. This study examined the impact of La(III) on physiological and biochemical indicators of Solanum nigrum L. (S. nigrum) exposed to Sodium hydrogen arsenate (SA) and Roxarsone (ROX) treatments under hydroponic conditions. Results indicated that La(III) treatment increased S. nigrum's aboveground As transport capacity by 58.68 %-213 % compared to no La(III) application. Additionally, foliar spraying of La(III) significantly inhibited the expression of toxic metabolites in the root system of S. nigrum, reducing Benzamide by 99.79 % under SA treatment and ZON by 87.72 % under ROX treatment. La(III) is likely to promote the transport of toxins and nutrients within and out of cells by activating ABC transporters, thereby enhancing S. nigrum's arsenic tolerance and metabolic activity. These findings provide molecular-scale insights into La(III) enhancement of the resilience of hyper-enriched plants and the remediation potential of contaminated sites.
稀土元素镧（La(III)）已被发现能有效提高作物产量，促进植物生长发育。砷（As）作为一类在环境中广泛存在的有毒金属，对生态和人类健康构成了严重威胁。目前，关于 La(III)在植物修复中应用以提高修复效率的研究还很少。本研究在水培条件下，研究了 La(III)对受砷酸钠（SA）和洛克沙胂（ROX）处理的龙葵（S. nigrum）生理生化指标的影响。结果表明，与不添加 La(III)相比，La(III)处理使龙葵地上部砷的转运能力提高了 58.68%–213%。此外，叶面喷施 La(III)可显著抑制龙葵根系中有毒代谢物的表达，在 SA 处理下，苯甲酰胺的含量降低了 99.79%，在 ROX 处理下，ZON 的含量降低了 87.72%。La(III)可能通过激活 ABC 转运蛋白，促进细胞内外毒素和营养物质的运输，从而增强龙葵对砷的耐受性和代谢活性。这些发现为 La(III)增强超富集植物的弹性和污染场地修复潜力提供了分子尺度的见解。
