Résumé:
"Soil salinity is one of the major and increasing problems of the agriculture worldwide,
particularly in wheat growing areas. Durum wheat (Triticum durum Desf.) is an important
cereal crop and source of staple food for many countries, where its production is mainly
البيولوجيا
threatened by salinity. The present study was conducted for two purposes. The first one
was to promote the salt tolerance of durum wheat by priming seeds with hormones (GA3)
and/or antioxidants (ascorbic acid). The results indicated that the effect of salinity upon
almost all the germination, growth and metabolism parameters of wheat embryo or
seedling can be alleviated by seed priming using GA3 and/or AsA. The second was to
investigate the potential biomarkers of mechanisms underlying salt tolerance induced by
ascorbate-priming by using proteomic technology. Our results revealed the involvement of
more than 160 metabolic proteins on the determination of seed vigor or priming-induced
salt tolerance, predominantly those involved in oxidative stress defense, protein synthesis
and turnover and phytohormones biosynthesis namely auxin. Altogether, these results
extend our understanding about salt stress tolerance in plants, and provide valuable
information for breeding programmes to improve salt tolerance in durum wheat.
