Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Biomed Res Int. 2013;2013:192986. doi: 10.1155/2013/192986. Epub 2013 Jul 15.
A Chinese medicinal fern Blechnum orientale (Linn) was separately collected from polluted and unpolluted sites to determine whether it could accumulate hazardous pollutants or not. Metal concentrations (Cu, Zn, Mn, Pb, Cd, Cr, As, and Hg) both in the fronds and roots and polycyclic aromatic hydrocarbons (PAHs) in the fronds of this fern were quantified. At both sites, roots of B. orientale had significantly higher heavy metals than the fronds. Concentrations of Pb, As, Hg, Cd, and Cu in the fronds at the polluted site were more than 2, 6, 7, 14, 5, and 13 times of those at the unpolluted site. Translocation factor and bioaccumulation factor implied that B. orientale did not have a good ability to transport heavy metals from the roots to the fronds. Total PAHs in the fronds at the polluted site were significantly higher than those at the unpolluted site, indicating the physiological PAHs absorption by B. orientale growing at polluted sites. Uptake of pollutants via stomata might be the main reason causing the significant accumulation of hazardous pollutants in the fronds of B. orientale. Large-scale systematical survey and intensive monitoring on pollutants in this medicinal fern should be necessarily strengthened.
一种中国药用蕨类植物 Blechnum orientale（Linn）分别从污染和未污染的地点采集，以确定它是否能够积累危险污染物。该蕨类植物的叶片和根中的金属浓度（Cu、Zn、Mn、Pb、Cd、Cr、As 和 Hg）以及叶片中的多环芳烃（PAHs）都进行了定量分析。在两个地点，B. orientale 的根部重金属含量明显高于叶片。受污染地点叶片中的 Pb、As、Hg、Cd 和 Cu 浓度分别是未污染地点的 2、6、7、14、5 和 13 倍以上。迁移因子和生物积累因子表明，B. orientale 从根部向叶片转运重金属的能力不强。受污染地点叶片中的总多环芳烃明显高于未污染地点，表明 B. orientale 在污染地点生长时吸收了生理多环芳烃。通过气孔吸收污染物可能是导致 B. orientale 叶片中危险污染物大量积累的主要原因。应加强对这种药用蕨类植物中污染物的大规模系统调查和强化监测。
