Evaluation Of The Toxic Effect Of Lead On Some Parameters Of Growth Radish Plant (raphanus Sativus L.)

The lead pollution has become a serious problem threatening our ecosystems with detrimental effects on crop production and biodiversity, so much research is currently focused on new environmentally friendly methods such as phytoremediation .The work undertaken registers with a view to study the physiological, biochemical behavior of the plant radish (Raphanus sativus L.). In this context, the dose (250, 500 and 1000 mg / l) of lead acetate were applied to radish (Raphanus sativus L.) relative to a control (absence of the Lead), for a period of two months. The results show apparent changes in various parameters studied in stressed plants compared to controls. Macroscopic (inhibition of germination rate, decreased biomass and size reduction), physiological (disruption of water status, decreased chlorophyll pigments and carotenoids content) were observed. Histological changes at the level of the rods (deformation of the walls of the medullary parenchyma cells), and roots (occlusion of xylem vessels) were observed. However, a strong correlation between soil Lead and plant Lead was noticed. Accordingly, lead uptake by Raphanus sativus L. is influenced by its bioavailability in soil.