环境工程学报2026，Vol.20Issue(4)：1101-1111,11.DOI:10.12030/j.cjee.202508041
浮萍对纳米氧化铅的胁迫响应及富集特征
Physiological responses and enrichment characteristics of duckweed(Landoltia punctata 0021)exposed to lead oxide nanoparticles
摘要
Abstract
While duckweed(Lemna minor)is well established as a hyperaccumulator for conventional lead pollution,its physiological,biochemical,and enrichment responses to lead oxide nanoparticles(PbO NPs)remain poorly understood.In this study,PbO NPs were synthesized via a plant-mediated biosynthetic route and applied in hydroponic experiments to investigate the effects of different concentrations(0-40 mg L-1)on growth,oxidative stress,lead accumulation,and subcellular distribution in Landoltia punctata 0021.The results demonstrated that the effects of PbO NPs on the growth of duckweed exhibited concentration-dependent,with low concentrations promoting and high concentrations inhibiting fresh weight,growth rate,and root length;the content of chlorophyll b decreased significantly and the content of carotenoids increased significantly when the concentration of PbO NPs was higher than 20 mg·L-1;with the increase of PbO NPs concentration,malondialdehyde content,and the activities of superoxide dismutase,peroxidase,and catalase enhanced.The results of lead content measurement showed that when the concentration of PbO NPs was 30 and 40 mg·L-1,the lead content of duckweed was 1 266 and 2030 mg·kg-1 respectively,with bioconcentration factor(BCF)>1,exceeding the lead hyperaccumulator standard.Subcellular distribution analysis revealed that the majority of accumulated lead was sequestered in the cell wall,followed by soluble fractions and organelles.In summary,this work elucidates the stress response and enrichment dynamics of duckweed exposed to PbO NPs,offering a promising phytoremediation material for water contaminated with metal-based nanoparticles.关键词
纳米氧化铅/浮萍/氧化应激/植物修复/富集特征Key words
lead oxide nanoparticles/duckweed/oxidative stress/phytoremediation/enrichment characteristics分类
资源环境引用本文复制引用
兰燕,耿和艳,杨贵利..浮萍对纳米氧化铅的胁迫响应及富集特征[J].环境工程学报,2026,20(4):1101-1111,11.基金项目
国家自然科学基金资助项目(32460309) （32460309）
贵州省科技厅基础研究重点项目(黔科合基础-ZK[2022]重点 021) （黔科合基础-ZK[2022]重点 021）
贵州省科学技术协会青年科技人才托举工程项目(GASTYESS202402) （GASTYESS202402）
