Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China.
Chemosphere. 2010 Nov;81(9):1098-103. doi: 10.1016/j.chemosphere.2010.09.023. Epub 2010 Oct 8.
A comprehensive understanding of the uptake, tolerance and transport of heavy metals in the wetland system through aquatic plants will be essential for the development of phytoremediation technologies. Copper accumulation and translocation of a submersed macrophyte Hydrilla verticillata (L.f.) Royle were investigated. Plant shoots showed a significant accumulation of Cu with a maximum of 30830 mg Cu kg⁻¹ dry weight after exposed to 4000 μg L⁻¹ Cu for 4d. Both roots and shoots can directly take up Cu from solution and Cu mainly accumulated in cell wall fractions. Moreover, H. verticillata predominantly accumulated Cu through shoots from the aqueous solutions because of the higher weights and bioaccumulation factors of shoots than those of roots. Acropetal translocation of Cu in the plant is higher than the basipetal translocation, which implies that upward translocation of Cu is mainly via the xylem and downward translocation is mainly through the phloem. These findings contribute to the application of submerged aquatic plants to copper removal from moderately contaminated waters.
通过水生植物全面了解湿地系统中重金属的吸收、耐受性和迁移，对于开发植物修复技术至关重要。本研究调查了沉水植物水蕴草（Hydrilla verticillata（L.f.）Royle）对铜的积累和转运。暴露于 4000μg/L Cu 4d 后，植物地上部分对 Cu 的积累达到最大值 30830mg Cu/kg 干重。根和地上部分都可以直接从溶液中吸收 Cu，Cu 主要积累在细胞壁部分。此外，由于地上部分的重量和生物积累因子均高于根部，水蕴草主要通过地上部分从水溶液中积累 Cu。Cu 在植物体内的向顶转运高于向基转运，这意味着 Cu 的向上转运主要通过木质部，向下转运主要通过韧皮部。这些发现有助于将沉水水生植物应用于从中度污染水中去除铜。
