Résumé:
Lead (Pb) is one of the most toxic metals used by humans and has no known
biological benefits. Its presence in high doses causes several disturbances in the plant.
Moringa oleifera Lam. is a plant species that grows in Asia and Africa, it has significant
potential for water purification and resistance to salt stress.
This work consists in studying the effect of lead on the biochemical and anatomical
parameters of Moringa oleifera Lam. after 60 days of culture in an uncontrolled glass
greenhouse, five doses of lead in the form of lead nitrate (Pb(NO3)2) (0 , 3 , 5 , 7 and 10
mM) were applied during one month.
Biochemical analysis showed a decrease in the content of leaf chlorophyll pigments
a, b and total with a significant accumulation of soluble sugars, proline with increasing
lead concentration at the aerial and root parts of Moringa oleifera Lam. Anatomical
analysis of roots and stems of Moringa oleifera Lam. showed that lead did not induce any
significant abnormality at the level of bark and root cylinder or epidermis, cortical
parenchyma and conductive tissues of stem compared to the control.
