期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 74, 期 -, 页码 296-301出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2011.06.012
关键词
Epiphytic vascular; Metal accumulation; Lipid peroxidation; MDA
资金
- Secretaria de Ciencia y Tecnica de la Universidad Nacional de Cordoba (SECyT-UNC)
- Brazilian Synchrotron Light Laboratory (LNLS) [D09B-XRF-1279]
Although several plants belonging to the Bromeliaceae family have been used as heavy metal accumulators in biomonitoring studies, their accumulation ability has not been investigated. The present study obtained the accumulation rates of Ni2+, Cu2+, Pb2+ and Zn2+ in leaves of Tillandsia capillaris and revealed their effects on lipid peroxidation by measuring the Malondialdehyde content (MDA). Leaves of T. capillaris were exposed to different metallic solutions of Cu2+, Ni2+, Pb2+ and Zn2+ cations. After this exposure period, the accumulation of these ions was measured by Total Reflection X-Ray Fluorescence (TXRF) analysis with Synchrotron Radiation, and the MDA content was calculated. Data sets were evaluated by a one-way analysis of variance (ANOVA) and a fitted regression hyperbola model. The results showed significant differences in the accumulation efficiencies of the cations under study. In addition, the enrichment factor (EF) estimated for these cations was higher for Ni2+, suggesting a greater affinity of the plant with this element. Over time, all the metals under study caused significant increases in the MDA content, indicating their toxicity effects even in the most diluted solutions used in this study. (C) 2011 Elsevier B.V. All rights reserved.
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