Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1589
Título: Trace elements and activity of antioxidative enzymes in Cistus ladanifer L. growing on an abandoned mine area
Autor: Abreu, Maria Manuela
Santos, Erika S.
Nabais, Cristina
Saraiva, Jorge A.
Palavras-chave: antioxidative enzymes
adaptative capacity
cistus ladanifer L.
sulphide abandoned mine
trace elements
Data: 2009
Editora: Springer
Citação: "Ecotoxicology". ISSN 0963-9292. 18 (2009) 860-868
Resumo: Abstract The Mediterranean shrub Cistus ladanifer grows naturally in Sa˜o Domingos (Portugal), an abandoned copper mine. High levels of trace elements in plants can generate oxidative stress increasing the activity of antioxidant enzymes. The aim of this work was to evaluate and compare As, Cu, Pb and Zn concentrations and the activity of the soluble and cell wall ionically bounded forms of the enzymes catalase, peroxidase and superoxide dismutase in leaves of C. ladanifer, collected in spring and summer, growing on Sa˜o Domingos mine and on a non-contaminated area (Pomara˜o). Sa˜o Domingos soils showed high total concentrations of As (2.6 g kg-1) and Pb (7.3 g kg-1) however the available fraction represented less than 1.5% of the total. C. ladanifer population from mine showed tolerance to Pb and Zn, which attain in leaves concentrations considered toxic for plants. The enzymatic activity of catalase, peroxidise and superoxide dismutase varied with plant populations and seasons, although with no particular trend, being specific to each trace element and enzyme cell localization. Catalase activity was evenly distributed between the soluble and ionically bounded forms, whereas the ionically bounded form of peroxidase predominated relatively to total activity, and the opposite was observed for superoxide dismutase. Spring and summer leaves from the two areas presented enzymatic activities in both fractions except to peroxidase soluble activities in leaves collected in summer. C. ladanifer enzymatic activity seems to be related with the co-existence of different stress factors (trace elements concentration, temperature, UV radiation and drought). The survival and growth of this species on contaminated mining soils is due to the presence of effective antioxidant enzyme-based defence systems.
URI: http://hdl.handle.net/10400.5/1589
ISSN: 0963-9292
Versão do Editor: http://www.springerlink.com
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