Effet du plomb sur les paramètres biochimiques du Cléome amblyocarpa Barr. & Murb

Abstract

Lead is the most important toxic element in the environment that affects the life of living organisms. In plants, lead plays no physiological role, its presence is a source of multiple disturbances even at low concentrations. The objective of this work is to evaluate the stressful effect of lead on the biochemical parameters of Cleome amblyocarpa Barr. & Murb., In order to assess its ability to decontaminate polluted soil. In order to achieve these objectives, the experiment is carried out on plants of Cleome, He chose because of its adaptation to the climatic and edaphic conditions of the Saharan ecosystem, as well as for its rapid growth and its significant biomass. He was exposed to different doses of lead (0, 250, 500, 1000, 1500, 2000, 2500 and 3000 ppm) in the form of lead nitrate (Pb(NO3)2) added to the growing medium which consists of sand and potting soil (95% soil / 5% potting soil). The estimate of plant responses to applied stress is measured by all the biochemical parameters. Accumulation of lead in stressed plants is accompanied by a drop in the yield of protein content, application of stress to lead resulted in increased accumulation of chlorophyll and soluble sugars.