Zinc, Lead and Cadmium Tolerance, Uptake and Accumulation by the Common Reed,Phragmites australis(Cav.) Trin. ex Steudel |
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| Authors: | YE, Z. H. BAKER, A. J. M. WONG, M. H. WILLIS, A. J. |
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| Affiliation: | Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S. Yorks, S10 2TN, UK Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong |
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| Abstract: | Zinc (Zn), lead (Pb) and cadmium (Cd) tolerance in populationsof seedlings ofPhragmites australisraised from seeds collectedfrom a mine site (Plombières, Belgium) contaminated withZn, Pb and Cd and three clean sites (Felixstowe,UK; Wisbech, UK; and Mai Po, Hong Kong) were studied under glasshouseconditions. Small differences were found between the metal-contaminatedpopulation and the three clean populations whenseedlings were grown in 1.0 µg ml-1Zn and 10.0 µgml-1Pb treatment solutions. In general, however, different populationsof seedlings showed similar growth responses, metal uptake andindices of Zn, Pb and Cd tolerance when cultured in the samemetal-contaminated media for 89 d or in the same metal treatmentsolutions (ZnSO4:1.0 and 4.0 µg ml-1Zn; Pb(NO3)2: 10.0and 25.0 µg ml-1Pb; CdSO4: 0.5 and 1.0 µg ml-1Cd)for 3 weeks. There was insufficient evidence to support thehypothesis that the metal-contaminated population has evolvedto a Zn-, Pb- or Cd-tolerant ecotype but the results indicatedsome differentiation between the populations with that fromHong Kong being the least productive under the experimentalconditions used. The implications of the findings on selectionof provenances for use in constructed wetlands for wastewatertreatment are discussed. Metal accumulation; heavy metal tolerance; Phragmites australis; population differentiation |
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