Is arsenite more toxic than arsenate in plants?
| Autor: | Pedro Henrique Santos-Neves, Daniel Gomes Coelho, Vinicius Melo da Silva, Heloísa Monteiro de Andrade, Samuel Coelho Araújo, Letícia Paiva de Matos, Claudio Sergio Marinato, Juraci Alves de Oliveira |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
animal structures Arsenites Health Toxicology and Mutagenesis chemistry.chemical_element 010501 environmental sciences Management Monitoring Policy and Law Toxicology 01 natural sciences Superoxide dismutase chemistry.chemical_compound Malondialdehyde Araceae Food science Arsenic 0105 earth and related environmental sciences Arsenite biology Superoxide Dismutase Chemistry Arsenate General Medicine Plants 010602 entomology Phytoremediation Biodegradation Environmental Catalase Bioaccumulation embryonic structures Toxicity biology.protein Arsenates Environmental Pollutants |
| Zdroj: | Ecotoxicology. 29:196-202 |
| ISSN: | 1573-3017 0963-9292 |
| DOI: | 10.1007/s10646-019-02152-9 |
| Popis: | In order to evaluate the differential absorption and toxicity of arsenate (AsV) and arsenite (AsIII), Lemna valdiviana plants were grown in a nutrient solution and subjected to 0.0 (control); 0.5; 1.0; 1.5; 2.0; 3.0; 4.0; 5.0 and 7.5 mg L−1 of AsIII or AsV for three days. Exposure to both chemical forms resulted in As bioaccumulation, although AsIII-grown plants showed higher As content in tissues. In AsV-grown plants, the relative growth rate (RGR) decreased to 50%, at a concentration of 4.0 mg L−1, while for treatments with AsIII, the same decrease was observed at 1.0 mg L−1. The tolerance index decreased with increasing concentrations, with lower values for AsIII. Plants treated with AsIII showed increased superoxide anion levels, whilst higher levels of hydrogen peroxide were present in AsV-treated plants. Moreover, malondialdehyde (MDA) levels were higher for plants subjected to AsIII when compared to AsV at lower concentrations. Concentrations of 1 mg L−1 of AsIII and 4 mg L−1 of AsV showed equivalent MDA levels. Superoxide dismutase and catalase activities were increased at low concentrations and were inhibited at higher concentrations of AsIII and AsV, whereas peroxidase activity was positively modulated by increased AsIII or AsV concentrations. In conclusion, L. valdiviana plants took up and accumulated arsenic as AsIII or AsV, demonstrating the potential for phytoremediation of this metalloid. Furthermore, AsIII-exposed plants showed enhanced toxicity when compared to AsV, at the same applied concentration, although toxicity was more related to internal As concentrations, regardless of the chemical form applied. |
| Databáze: | OpenAIRE |
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