Impacte du plomb sur la cinétique du taux de germination et la longueur des radicules et des tigelles de Moringa oleifera L.

Abstract

One of the major environmental problems is the contamination of the atmosphere, water and soil by many toxic elements and compounds such as lead, which is a harmful element and has no biological advantage. This requires the use of an alternative technique for the decontamination of contaminated soils, called "Phytoremediation", which consists of using plants and/or micro-organisms to decontaminate these soils. Plants are more sensitive to the germination stage because it is the first phase of plant development and this is a critical step in the evolution of plants in a leadcontaminated environment. The purpose of this work is to determine the impact of increasing concentrations of Pb (0, 3, 5, 7, 7 and 10mM) on the kinetics of the germination rate and the elongation of the roots and tigelles of Moringa oleifera L. The seeds were put to germinate in Petri dishes, at a rate of 10 seeds per dish and five repetitions for each treatment, which are then placed in the dark in an oven, at a temperature of 27°c, for fifteen days. The number of sprouted seeds and lengths of roots and tigels were collected daily every other day. The results obtained show that lead has a negative effect on the germination of Moringa oleifera L. seeds, which results in a decrease in the germination rate of leadtreated seeds compared to the control where a germination rate of 100% was recorded in the absence of Pb, as well as a significant decrease in the elongation of Moringa oleifera L. roots and tigelles, at the level of seeds treated with high lead concentrations (7 and 10 mM).