Résumé:
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).
