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|Title: ||Trace elements and activity of antioxidative enzymes in Cistus ladanifer L. growing on an abandoned mine area|
|Authors: ||Abreu, Maria Manuela|
Santos, Erika S.
Saraiva, Jorge A.
|Keywords: ||antioxidative enzymes|
cistus ladanifer L.
sulphide abandoned mine
|Issue Date: ||2009|
|Citation: ||"Ecotoxicology". ISSN 0963-9292. 18 (2009) 860-868|
|Abstract: ||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.|
|Publisher version: ||http://www.springerlink.com|
|Appears in Collections:||DCA - Artigos de Revistas|
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