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Our work has focused on the quantitative and qualitative study of the polyphenols extracted from the aerial parts of four varieties: two of soft wheat (Triticum aestivum: MP, FA) and two varieties of barley (Hordeum vulgar: Jaidore, saida) both with and without water deficit Treatments (WD) and (NWD) respectively, and to test their antimicrobial activities (antibacterial: E.coli and Bacillus, antifungal: Fuzarium). The results of the quantitative analysis of ethanol extracts showed that the polyphenols content is considerable with the existence of an intra-varietal and inter-varietal variability. The variability is also distinguished (WD) and (NWD) treatment. The qualitative study of polyphenols begins with allocations between four solvents with different polarities .This leads to the obtaining of different phases. Their composition is identified by the UV spectrophotometer and the Thin Layer Chromatography. The obtained results indicate that the majority of flavonoids detected are flavonols and flavones type. The antimicrobial activity test revealed that the extracts of each variety had a considerable inhibitory effect on the growth of E.coli and Bacillus. In contrast, fungal activity has no effect on Fusarium.

Photochemical Study and Biological Activity of Phenolic Compounds of four Varieties of common Wheat (Triticum Aestivum) and Barley (Hordeum vulgar) subjected to Water Stress