Etude ecophysiologique et phytochimique de deux espèces d’Acacia

Abstract

Through this work, we studied intra- and interspecific variability in the phenolic composition of two species, Acacia albida and Acacia raddiana and the ex-situ behavior of the latter vis-à-vis the salt stress through morphological, physiological and biochemical parameters. The results of the phytochemical screening of the two species showed that A.albida is richer in polyphenols (100.94 mg EAG / g DM) and active for scavenging free radical DPPH (26 µg / ml). This species also showed good activity, especially the leaves and bark, through other tests where we noted a total activity equal to 68.67 mg EAG / g DM, an IC50 = 104.33 µg / ml of ABTS assay and an EC50 = 34.33 µg / ml for the reducing power of iron. The results of the study of the impact of salinity have shown that the seed can germinate at concentrations up to 12 g / l and maintain growth even at 300 mM NaCl with a decrease in the ratio of K + / Na + selectivity. Moderate doses of 50 and 100 mM of salt does not affect the biomass and tissue hydration and stimulate even the accumulation of phenolic compounds in imparting their strong antioxidant activity. This work led to the development of scientific knowledge in order to use as soil restoration means degraded drylands and recoverable source of bioactive molecules.