L’effet du stress salin (NaCl) et métallique (plomb) sur quelques paramètres biochimiques d’Atriplex halimus L.

Abstract

The pollution of the soil is one of the environmental problems most dangerous, in this context in our laboratory (biodiversity and conservation of soil water) we tried to make the study of the effect of salinity and lead on the plants. The use of the plants halophytes in the rehabilitation of the polluted soils and is of the most widespread techniques in this direction. The chénopodiacée family regroup important halophytes such as Atriplex. This work was executed using the plant of Atriplex halimus L in plastic pots, after one month of germination and growth the plants were irrigated regularly by nutritive solution (Hoagland) and are stressed with the dose of 0%, 0, 5% and 3% of NaCl during four month. Before one month of the realization of the biochemical analyses, the plants were subjected to different concentration of lead (0ppm, 800ppm, 1600ppm, 2400ppm). Then our study ends with estimations of the chlorophylle (a), chlorophylle (b), chlorophylle (a+b), the proline, the relative content water and soluble sugars. The results obtained show that the saline and metal stress can create physiological and biochemical disturbances translated by an increase or a reduction in the contents of parameters studied. But in spite of these variations the plants of Atriplex give a good adaptation against these constraints. The results suggest that Atriplex halimus L. can be used in a system of depollution of soil because they have particular properties of natural resistance to many abiotic constraints.