Toxicity of arsenic (III) and (V) on plant growth, element uptake, and total amylolytic activity of mesquite (Prosopis juliflora x P. velutina)
| Autor: | Ntebogeng S. Mokgalaka-Matlala, Edith Flores-Tavizón, Jorge L. Gardea-Torresdey, Jose R. Peralta-Videa, Hiram Castillo-Michel |
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| Rok vydání: | 2008 |
| Předmět: |
Arsenites
Prosopis chemistry.chemical_element Plant Science Plant Roots chemistry.chemical_compound Dry weight Botany Environmental Chemistry Arsenic Arsenite biology Dose-Response Relationship Drug fungi Arsenate food and beverages Starch biology.organism_classification Pollution Horticulture Biodegradation Environmental chemistry Seedlings Toxicity Shoot Arsenates Phytotoxicity Plant Shoots |
| Zdroj: | International journal of phytoremediation. 10(1) |
| ISSN: | 1522-6514 |
| Popis: | The effects of arsenite [As(III)] and arsenate [As(V)] on the growth of roots, stems, and leaves and the uptake of arsenic (As), micro- and macronutrients, and total amylolytic activity were investigated to elucidate the phytotoxicity of As to the mesquite plant (Prosopis juliflora x P. velutina). The plant growth was evaluated by measuring the root and shoot length, and the element uptake was determined using inductively coupled plasma optical emission spectroscopy. The root and leaf elongation decreased significantly with increasing As(III) and As(V) concentrations; whereas, stem elongation remained unchanged. The As uptake increased with increasing As(III) or As(V) concentrations in the medium. Plants treated with 50 mg/L As(III) accumulated up to 920 mg/kg dry weight (d wt) in roots and 522 mg/kg d wt in leaves, while plants exposed to 50 mg/L As(V) accumulated 1980 and 210 mg/kg d wt in roots and leaves, respectively. Increasing the As(V) concentration up to 20 mg/L resulted in a decrease in the total amylolytic activity. On the contrary, total amylolytic activity in As(III)-treated plants increased with increasing As concentration up to 20 mg/L. The macro- and micronutrient concentrations changed in As-treated plants. In shoots, Mo and K were reduced but Ca was increased, while in roots Fe and Ca were increased but K was reduced. These changes reduced the size of the plants, mainly in the As(III)-treated plants; however, there were no visible sign of As toxicity. |
| Databáze: | OpenAIRE |
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