Evaluation of the Retarding Effect of Salt Stress on the Activity and Expression of Peroxidases in Nine Durum Wheat Cultivars (Triticum durum Desf.)

Abstract

Research on stress tolerance is imperative to be able to stabilize and improve yields of a species such as durum wheat in Algeria. Several studies have shown that salt stress causes, in fact, a delay and a marked inhibition of growth and development. Furthermore, several studies have clearly shown the important role of peroxidases in plant tolerance to salt stress. In nine cultivars of wheat (Triticum durum Desf.), a daily peroxidase enzymatic profiles and activities from 1st to 7th day of germination in the absence of stress (0 mM NaCl), and only those of the treated groups (51,3 mM; 28,3 mM and 256,6 mM NaCl) aged of 7 days are followed, with the aim to demonstrate the delay caused by salt stress on activity and profiles of peroxidases, as well as search for possible differences between the cultivars studied. The results of this work have enabled to suggest the existence of a significant delay and a clear inhibition of the expression of peroxidase isoforms in durum wheat cultivars studied. The cultivars Belikh2 and Eider known for their tolerance to salt, present in zone with an average rate of migration, bands with significantly superior intensity, compared to other cultivars whose tolerance is not specified. Whereas, the comparison of the enzymatic activity during the application of a salt stress of a continuous way from setting seed germination, appears not to allow the assessment of delay caused.