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Lead phytotoxicity on wheat (Triticum aestivum L.) seed germination and seedlings growth.

Comptes rendus biologies (2011-02-22)
Mostafa Lamhamdi, Ahmed Bakrim, Ahmed Aarab, René Lafont, Fouad Sayah
ABSTRACT

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 (NO(3))(2) (0.05; 0.1; 0.5; 1g/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 α-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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lead(II) nitrate, ACS reagent, ≥99.0%
Sigma-Aldrich
Lead(II) nitrate, 99.999% trace metals basis
Sigma-Aldrich
Lead(II) nitrate, ≥99.95% trace metals basis