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Response of two wetland plant species to Cd exposure at low and neutral pH
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2009 (English)In: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 65, no 2-3, 417-424 p.Article in journal (Refereed) Published
Abstract [en]

Emerged and submerged plants are used in treating various metal-containing wastewaters, such as stormwater (neutral pH) and acid mine drainage (low pH). The aim was to investigate the appearance of a set of possible mechanisms to detoxify Cd in plants and whether their appearance differ due to the surrounding pH and/or plant type. One emergent (Carex rostrata) and one submerged (Elodea canadensis) macrophyte were exposed to 0, 0.05, and 0.5 μM Cd for 3 d in hydroponic solutions at pH 3.5 and 6.9. We analysed cadmium accumulation, thiol-rich peptide concentrations and cell wall-bound Cd in plants, organic acid content and pH change in surrounding water cation exchange capacity (CEC) of plant tissue. Both plant species accumulated Cd in their tissues, and thus did not exclude it and C. rostrata decreased the relative Cd distribution to its shoots with increasing Cd addition. In both species, Cd was immobilized through cell wall binding, and thiol-rich peptides synthesized in the presence of Cd that may participate in Cd binding. In addition, E. canadensis increased its CEC by synthesizing new metal-binding sites in the cell walls. Organic acid composition in surrounding water did not change with Cd addition and had no effect on Cd detoxification. However, E. canadensis increased the surrounding pH from pH 3.5 in the presence of Cd; the surrounding pH did not, however, influence the detoxification mechanisms.

Place, publisher, year, edition, pages
2009. Vol. 65, no 2-3, 417-424 p.
Keyword [en]
Cadmium accumulation, Wetland plants, Detoxification mechanisms, Thiol-rich peptides
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-24373DOI: 10.1016/j.envexpbot.2008.11.011ISI: 000263664100034OAI: diva2:197404
Available from: 2007-08-06 Created: 2007-08-06 Last updated: 2011-03-01Bibliographically approved
In thesis
1. Role of plants in treating metal-polluted waters in wetlands
Open this publication in new window or tab >>Role of plants in treating metal-polluted waters in wetlands
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall aim of this thesis was to evaluate the role of wetland plants in wetland treatment of metal-polluted waters. The specific aims were to investigate metal uptake in various wetland plant species; whether and how wetland plants tolerate high metal concentrations in their immediate surroundings, and how the pH and metal concentrations of polluted waters influence metal uptake in wetland plants were also investigated.

Acid mine drainage with low pH (3.5) and high metal concentrations, and stormwater with a near neutral pH and lower metal concentrations were the two waters treated. The submerged plant species Elodea canadensis and Sparganium hyperboreum, the floating-leaved plant species Potamogeton natans, and the emergent plant species Carex rostrata, Eriophorum angustifolium, and Phragmites australis were exposed to concentrations of cadmium (Cd), copper (Cu), iron (Fe), lead (Pb), and zinc (Zn) naturally found in these waters.

Low pH and high metal concentrations in the polluted waters were demonstrated to have a decreased effect on the treatment efficiency. The presence of submerged and floating-leaved plant species increased the treatment efficiency of a wetland by taking up dissolved metals, while metal uptake by emergent plant species was minor.

The wetland plant species displayed only few signs of stress when exposed to Zn, Cu, and Cd. Thiol-rich peptides, increased cell wall binding, and rising pH in the medium are possible mechanisms whereby Cd is detoxified in the plant tissue.

The overall conclusion was that using wetlands to treat polluted waters is possible, although treatment efficiency is influenced by the pH and metal concentrations in the polluted water. The role of plants was dependent on the character of the waste water and on the specific plant species used. Wetland plants tolerate metal concentrations in their tissues by activating internal mechanisms that detoxify the metals.

Place, publisher, year, edition, pages
Stockholm: Botaniska institutionen, 2007. 38 p.
treatment wetlands, stormwater, AMD, metal uptake, wetland plants
National Category
Biological Sciences
Research subject
Plant Physiology
urn:nbn:se:su:diva-6985 (URN)978-91-633-1164-2 (ISBN)
Public defence
2007-09-25, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00
Available from: 2007-08-06 Created: 2007-08-06Bibliographically approved

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