| Toxic effect of arsenate and cadmium alone and in combination on giant duckweed (Spirodela polyrrhiza L.) in response to its accumulation. | |
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MedLine Citation:
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PMID: 18000854 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To evaluate the biological effects of wastewater samples containing heavy metals, the effects of metal Cd (II) and As (V) were studied on Spirodela polyrrhiza L. The plants were exposed at metal concentrations 0.1, 0.5, 1, 2 microM of Cd (II) and 1, 5, 10, 20 microM of As (V) for a period of 1, 4, 7 d (day) alone and in combination of both. Plants accumulated 1855 mg kg(-1) dw (dry weight) Cd and 1230 mg kg(-1) dw As after 7 d in alone, whereas it was 885 mg kg(-1) dw Cd and 865 mg kg(-1) dw As in combination. The toxicological parameters such as fresh biomass, photosynthetic pigments, and total protein contents increased up to 2 microM of Cd (II) after 1 d and 10 microM of As (V) after 4 d with respect to control (Hormesis effect), followed by gradual decline at higher concentrations and duration. In case of Cd (II) a maximum decrease of 58% in protein content, 62% in fresh biomass, and 78% in total chlorophyll was observed at 2 microM, whereas, with As (V) 38% decrease in protein content, 34% in fresh biomass, and 52% in total chlorophyll was shown at 20 microM after 7 d. The metal tolerance strategy against metal induced reactive oxygen species adopted by the plants was investigated with reference to nonprotein thiols (NP-SH), cysteine, and ascorbic acid. The results of combined treatment revealed reduced toxicity at the level of fresh biomass, protein content, and chlorophyll; however, the amount of nonenzymatic antioxidant did not significantly (P = 0.172) increase as compared to alone treatment. Finally, it was concluded that due to high metal accumulation coupled with defense potential, the plant appears to have a potential for its use as phytoremediator species of aquatic environments. |
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Authors:
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Chandra Shekhar Seth; Pranav Kumar Chaturvedi; Virendra Misra |
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Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: Environmental toxicology Volume: 22 ISSN: 1520-4081 ISO Abbreviation: Environ. Toxicol. Publication Date: 2007 Dec |
Date Detail:
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Created Date: 2007-11-20 Completed Date: 2008-01-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100885357 Medline TA: Environ Toxicol Country: United States |
Other Details:
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Languages: eng Pagination: 539-49 Citation Subset: IM |
Affiliation:
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Ecotoxicology Section, Industrial Toxicology Research Centre, Post Box No. 80, M.G. Marg, Lucknow 226001, India. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Antioxidants
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metabolism Araceae / drug effects*, metabolism Arsenates / toxicity* Biomass* Cadmium / toxicity* Chlorophyll / metabolism Humans Metals, Heavy / toxicity* Water Pollutants, Chemical / toxicity* |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Arsenates; 0/Metals, Heavy; 0/Water Pollutants, Chemical; 1406-65-1/Chlorophyll; 7440-43-9/Cadmium; 7778-39-4/arsenic acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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