Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China.
Environ Pollut. 2009 Aug-Sep;157(8-9):2394-404. doi: 10.1016/j.envpol.2009.03.022. Epub 2009 Apr 15.
Arsenic, Pb and Zn tolerance and accumulation were investigated in six populations of Pteris vittata collected from As-contaminated and uncontaminated sites in southeast China compared with Pteris semipinnata (a non-As hyperaccumulator) in hydroponics and on As-contaminated soils. The results showed that both metallicolous and nonmetallicolous population of P. vittata possessed high-level As tolerance, and that the former exhibited higher As tolerance (but not Pb and Zn tolerance) than the latter. In hydroponic culture, nonmetallicolous population clearly showed significantly higher As concentrations in fronds than those in metallicolous populations. In pot trials, As concentrations in fronds of nonmetallicolous population ranged from 1060 to 1639 mg kg(-1), about 2.6- to 5.4-folds as those in metallicolous populations. It was concluded that As tolerance in P. vittata resulted from both constitutive and adaptive traits, Pb and Zn tolerances were constitutive properties, and that nonmetallicolous population possesses more effective As hyperaccumulation than metallicolous populations.
砷、铅和锌耐受性和积累能力的研究在从中国东南部砷污染和非污染地区采集的 6 个凤尾蕨种群中进行，同时还在水培和砷污染土壤中对凤尾蕨（一种非砷超积累植物）进行了研究。结果表明，无论是富金属还是贫金属凤尾蕨种群都具有高水平的砷耐受性，而且前者比后者表现出更高的砷耐受性（但对铅和锌的耐受性没有影响）。在水培培养中，贫金属凤尾蕨种群的叶片中砷浓度明显高于富金属种群。在盆栽试验中，贫金属凤尾蕨种群叶片中的砷浓度范围为 1060 至 1639mgkg(-1)，约为富金属种群的 2.6-5.4 倍。结论是，凤尾蕨的砷耐受性源于组成性和适应性特征，铅和锌耐受性是组成性特性，而且贫金属凤尾蕨种群比富金属种群具有更有效的砷超积累能力。
