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Accueil du site → Doctorat → Espagne → 2012 → Salinidad y trigo duro : Firmas isotópicas, actividad enzimática y expresión génica

Universitat de Barcelona (2012)

Salinidad y trigo duro : Firmas isotópicas, actividad enzimática y expresión génica

Yousfi, Salima

Titre : Salinidad y trigo duro : Firmas isotópicas, actividad enzimática y expresión génica

Auteur : Yousfi, Salima

Université de soutenance : Universitat de Barcelona

Grade : Tesis Doctoral 2012

Résumé
Inadequate irrigation for long term and under conditions of high evapotranspiration demand, combined with the use of poor water quality and the lack of adequate drainage frequently induces the salinization of arable land causing a significant increase in the area affected by salinity. Salinity is an environmental factor that limits in a remarkable manner the production of crops in many parts of the world, but especially in arid and semiarid regions like the Mediterranean. Under these conditions, which is often grown durum wheat improvement for tolerance to salinity under irrigation deficit may be one of the strategies to alleviate this problem. This Thesis shows that isotope compositions of carbon (δ13C), oxygen (δ18O), and nitrogen (δ15N) and the concentration of nitrogen in dry matter are potentially and effective criteria for discriminating between different growing conditions and between genotypes tolerant or susceptible to salt. Furthermore, the results of this study reflect the importance of nitrogen metabolism in tolerance to salinity. Additionally, this thesis develops a model relating genotypic tolerance to different conditions of salinity and drought with the signatures of the three isotopes (C, O, N), together with photosynthetic and transpiration exchanges and parameters key of nitrogen metabolism such as nitrogen concentration and activities of the glutamine synthetase and nitrate reductase. Finally, we study the relationship between the expression of genes potentially key in the tolerance to salinity and drought and genotypic variability in response to different combinations of these stresses

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Page publiée le 8 septembre 2012, mise à jour le 13 février 2019