Phytochemical potential and antioxidant activity of Phaseolus vulgaris .L (Var, Sidi Ferredj) in the face of salt stress

Abstract

Phaseolus vulgaris.L (var, Sidi Ferredj), a local fabaceae, (creation by the services of the technical institute of vegetable and industrial crops: ITCMI Algeria, after adaptation to the coastal soils), has proven its capability for tolerance to salt stress, through its phytochemical potential, allowing it to resist this abiotic constraint. The objective of our study was to highlight the metabolic capital, in particular the phenolic compounds synthesized by P. vulgaris.L (var, Sidi Ferredj), subjected to salt stress at different concentrations and to valorize this capital by antioxidant activity. Potting trials of the species, which were the subject of our study, were conducted in a greenhouse and under semi-controlled conditions, applying salt stress induced by irrigation with increasing salinity solutions. NaCl-based (0.50,100 and 200 meq.l-1) and a second one based on a combination of NaCl and CaCl2 salts (100 and 150 meq.l-1); the study was completed by the quantification of the phytochemical potential in response to this salinity stress, and which were total phenols, flavonoids and tannins . The antioxidant potential was assessed according to the DPPH test. The results obtained showed that the concentrations of NaCl (50 and 100 meq.l-1) stimulated the accumulation of phenolic compounds, with remarkable contents of total phenols, flavonoids and condensed tannins, unlike the concentration of 200 meq.l-1 NaCl, which appeared to be unfavourable and induced a reduction, particularly total phenols, while the antioxidant activity raised with the increase in salt stress.