Journal
COMPTES RENDUS BIOLOGIES
Volume 334, Issue 2, Pages 118-126Publisher
ACAD SCIENCES
DOI: 10.1016/j.crvi.2010.12.006
Keywords
Lead; Triticum aestivum; Germination; Seedlings growth; Antioxidant enzymes
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Lead (Pb) is an environmental pollutant extremely toxic to plants and other living organisms including humans. To assess Pb phytotoxicity, experiments focusing on germination of wheat seeds were germinated in a solution containing Pb (NO3)(2) (0.05; 0.1; 0.5; 1 g/L) during 6 days. Lead accumulation in seedlings was positively correlated with the external concentrations, and negatively correlated with morphological parameters of plant growth. Lead increased lipid peroxidation, enhanced soluble protein concentrations and induced a significant accumulation of proline in roots. Esterase activity was enhanced in the presence of lead, whereas a-amylase activity was significantly inhibited. Antioxidant enzymes activities, such as, ascorbate peroxidase, peroxidase, superoxide dismutase, catalase and glutathione S-transferase were generally significantly increased in the presence of lead in a dose-dependent manner. The present results thus provide a model system to screen for natural compounds able to counteract the deleterious effects of lead. (C) 2010 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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