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Universitat Politècnica de València (2021)

Mecanismos de tolerancia a estrés salino e hídrico en plantas endémicas, raras o amenazada

González Orenga, Sara

Titre : Mecanismos de tolerancia a estrés salino e hídrico en plantas endémicas, raras o amenazada

Auteur : González Orenga, Sara

Université de soutenance : Universitat Politècnica de València

Grade : Docotral Tesis 2021

Résumé
Drought and salinity are the environmental factors that most affect plants, although in general Mediterranean plants are well adapted to adverse conditions. Predictions estimate that, due to global warming, environmental conditions will become more stressful, especially in semi-arid and arid areas, such as many areas of the Iberian Peninsula. These conditions may affect the presence of many wild species, especially those that are already threatened, rare or endemic. Both drought and salt stress cause the activation of a series of defence or response mechanisms in plants, which include, among others, the control of ionic transport, the accumulation of compatible solutes or osmolytes, and the activation of antioxidant systems. To contribute to the conservation and/or reintroduction of species of interest in priority habitats, a multidisciplinary study has been carried out covering parameters that may affect their populations, such as climate, soil and accompanying vegetation, together with comparative studies on responses to drought and salinity. To better understand tolerance mechanisms, genetically related species with different levels of tolerance have been included in the study, in addition to taxa of conservation interest. The study has two main objectives : i) to establish the relative tolerance to water and salt stress of the species according to their distribution in nature and based on field analyses and, according to the relative inhibition of their growth under stress-induced conditions ; and, ii) to evaluate stress-induced biochemical changes by analysing different mechanisms (inhibition of photosynthesis, ionic transport, osmolyte accumulation, antioxidant mechanisms).

Mots Clés  : Salt stress , Water Stress , Tolerance mechanisms , Endemic plants , Estrés salino , Estrés hídrico , Limonium , Mecanismos de Tolerancia , Bupleurum , Thalictrum , Plantas Endémicas

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Page publiée le 19 décembre 2021