INVOLVEMENT OF ABIOTIC STRESS TOLERANCE MECHANISMS IN BIOTIC STRESS TOLERANCE IN DURUM WHEAT
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Date
2020
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Journal of Fundamental and Applied Sciences
Abstract
The objective of our study is to implicate the mechanisms of tolerance to abiotic stress by the
synthesis of metabolites in tolerance to biotic stress. The extracted metabolites; proline, sugars
and polyphenols from durum wheat seedlings subjected to heat shock (40 °C), used to test
antifungal activity on two fungal strains, powdery mildew and penicillium, under controlled
conditions. The boussellam variety is more tolerant of applied stress than the Ciccio and Vitron
varieties. The concentration of the three osmolytes varies from one variety to another; it
increases in genotypes stressed compared to controls. Antifungal activity results in the
appearance of an inhibition zone around the disc impregnated with the studied extract. Sugars
have proven to be a highly effective antifungal agent compared to proline and polyphenols with
maximum values (28,33 ± 2 mm) in oidium and (29 ± 1 mm) in penicillium.