Effective phytoremediation by aquatic plant such as duckweed could be applied to solve Cd pollution. In the present study, the impact of Graphene oxide (GO) on the accumulation of Cd in duckweed has been studied. The response of duckweed was also investigated, concluding growth, Cd²⁺ flux, and gene expression response. Results showed that GO promoted the accumulation of Cd in duckweed. After 6 h of Cd enrichment in duckweed, Cd content was about 1.4 times that of the control group at fronds and 1.25 times that of the control group at roots, meanwhile, Cd content in the water system was 0.67 times that of the control group. The Cd²⁺ influx increased significantly. 4471 genes were up-regulated and 3230 genes were down-regulated significantly as duckweed treated with GO under Cd treatment. Moreover, phagosome pathway was downregulated, some key proteins: Stx7, Rab7 and Tubastatin B (TUBB) were significantly downregulated with GO addition under Cd stress. Scanning electron microscope (SEM) observation showed that GO and Cd were attached on the cell surface of duckweed as white crystal. GO could be applied in phytoremediation by duckweed of Cd in aquatic system.

利用浮萍等水生植物进行有效的植物修复可以解决镉的污染问题。在本研究中，已经研究了氧化石墨烯（GO）对浮萍中Cd积累的影响。还研究了浮萍的响应，包括生长，Cd ²⁺通量和基因表达响应。结果表明，GO促进了浮萍中Cd的积累。浮萍中镉富集6 h后，叶片中Cd含量约为对照组的1.4倍，根部Cd含量约为对照组的1.25倍，同时水系统中的Cd含量为对照组的0.67倍。镉²⁺涌入量明显增加。在镉处理下，GO处理浮萍后，上调了4471个基因，下调了3230个基因。此外，在镉胁迫下，GO的添加显着下调了吞噬途径的下调，其中一些关键蛋白：Stx7，Rab7和Tubastatin B（TUBB）明显下调。扫描电子显微镜（SEM）观察表明，GO和Cd以白色晶体的形式附着在浮萍的细胞表面。GO可用于水生系统中镉浮萍的植物修复。