Lead Induced Oxidative Stress and Development Change on Coriandrum sativum

Abstract

Lead (Pb) is ubiquitous pollutant in environment which causes many toxic effects, at high and low dose, Lead makes disruptions at all plants by reduction its growth and development of aerial parts and roots, however in Coriandrum the mechanism it not well known. In this study, assessing the capacity of lead to induce a dysfunctioning in development of roots and aerial parts at different concentrations after 21 day and 40 days, biochemical parameters of oxidative stress and morphological change on Coriandrum sativum was studied in the present investigation. The seeds were sprayed with a solution containing lead to different concentrations for 40 days with six lead levels (0 as control, 500, 1000, 1500, 2000, 2500 and 3000 mg.l-1). The soil used was characterized and parameters such as growth, oxidative damage markers (lipid peroxidation, proline, chlorophyll and hydrogen peroxide contents) were investigated. The results show that there is no change in properties of roots, sheets and stalks indicate that chlorophyll and carotenoid concentration were significantly decreased at 3000 mg.l-1 Pb than control. Lipid peroxidation and H2O2levels were increased at the dose of 2500 and 3000 mg l-1 compared to control treatment; no difference was noted between 500 mg.l-1 and control in all part in plant. Morphological studies show that the group exposed to 3000 mg.l-1 of lead shows a very important development of the tissues of roots and stems compared to control and to the group exposed to 500 mg.l-1 of Pb. changes in morphological structure and non-enzymatic antioxidants have shown that lead exposure causes a significant perturbation on Coriandrum sativum Linn seedlings affecting biochemical and physiological processes.