School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
PowerChina Zhongnan Engineering Corporation Limited, Changsha 410004, China.
Int J Environ Res Public Health. 2022 Nov 14;19(22):14968. doi: 10.3390/ijerph192214968.
Phytoremediation could be an alternative strategy for lead (Pb) contamination. has been reported as a newly potential plant for sustainable phytoremediation of Pb-contaminated soil. Physiological indexes, enrichment accumulation characteristics, Pb subcellular distribution and microstructure of were carefully studied at different levels of Pb stress (0-1200 mg/L). The results showed that plant growth increased up to 123.8% and 112.7%, relative to the control group when Pb stress was 200 mg/L and 400 mg/L, respectively. However, the average height and biomass of decrease when the Pb stress continues to increase. In all treatment groups, the accumulation of Pb in plant organs showed a trend of root > stem > leaf, and Pb accumulation reached 81.31%~86.69% in the root. Chlorophyll content and chlorophyll a/b showed a rising trend and then fell with increasing Pb stress. Catalase (CAT) and peroxidase (POD) activity showed a positive trend followed by a negative decline, while superoxide dismutase (SOD) activity significantly increased with increasing levels of Pb exposure stress. Transmission electron microscopy (TEM) showed that Pb accumulates in the inactive metabolic regions (cell walls and vesicles) in roots and stems, which may be the main mechanism for plants to reduce Pb biotoxicity. Fourier transform infrared spectroscopy (FTIR) showed that Pb stress increased the content of intracellular -OH and -COOH functional groups. Through organic acids, polysaccharides, proteins and other compounds bound to Pb, the adaptation and tolerance of to Pb were enhanced. showed good phytoremediation potential and has broad application prospects for heavy metal-contaminated soil.
植物修复可能是一种替代策略，用于铅（Pb）污染。已被报道为一种新的潜在植物，可用于可持续修复 Pb 污染土壤。在不同 Pb 胁迫水平（0-1200mg/L）下，对 进行了仔细研究，包括生理指标、富集积累特性、Pb 亚细胞分布和微观结构。结果表明，与对照组相比，当 Pb 胁迫分别为 200mg/L 和 400mg/L 时，植物生长增加了 123.8%和 112.7%。然而，当 Pb 胁迫继续增加时，植物的平均高度和生物量下降。在所有处理组中，植物器官中 Pb 的积累表现出根>茎>叶的趋势，Pb 积累在根中达到 81.31%-86.69%。叶绿素含量和叶绿素 a/b 呈上升趋势，然后随 Pb 胁迫的增加而下降。过氧化氢酶（CAT）和过氧化物酶（POD）活性呈正趋势，随后负下降，而超氧化物歧化酶（SOD）活性随 Pb 暴露胁迫水平的增加而显著增加。透射电子显微镜（TEM）显示 Pb 积累在根和茎的非活性代谢区（细胞壁和液泡）中，这可能是植物降低 Pb 生物毒性的主要机制。傅里叶变换红外光谱（FTIR）显示 Pb 胁迫增加了细胞内-OH 和-COOH 官能团的含量。通过与 Pb 结合的有机酸、多糖、蛋白质等化合物，增强了 对 Pb 的适应和耐受能力。表现出良好的植物修复潜力，在重金属污染土壤方面具有广阔的应用前景。
