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Accueil du site → Doctorat → Espagne → 2020 → Inter-cultivar variability in the response of garlic (allium sativum l.) To water availability : a functional basis for the improvement of garlic production under limiting climatic condition

Universidad de Castilla-La Mancha (2020)

Inter-cultivar variability in the response of garlic (allium sativum l.) To water availability : a functional basis for the improvement of garlic production under limiting climatic condition

Sánchez Virosta, Álvaro

Titre : Inter-cultivar variability in the response of garlic (allium sativum l.) To water availability : a functional basis for the improvement of garlic production under limiting climatic condition

Auteur : Sánchez Virosta, Álvaro

Université de soutenance : Universidad de Castilla-La Mancha

Grade : Doctoral Teis 2020

Résumé partiel
Climate change, the foreseeable increasing world population and current global consumption patterns, pose new challenges for agriculture and world food supply. Climate change threatens agricultural production, especially in already arid and semi-arid regions such as the Mediterranean, where extreme climatic events (e.g. droughts, heat waves, etc.) in the last decades, are increasingly frequent. Good agricultural practices such as crop rotations, the efficient use of fertilizers, the appropriate choice of cultivation areas and a more sustainable control of pests and weeds can mitigate climate change effects on agriculture. Along with this, and given the probable water scarcity scenario, finding more resistant cultivars to environmental stressors (particularly water scarcity), is fundamental for an effective agricultural adaptation to climate change. A good understanding on intraspecific variability patterns of the functional mechanisms involved in plant responses to the environment (ecophysiological approach), is basic for cultivar selection and enhanced crop yield. In particular, key functional traits associated with plant water relations are crucial in the study of intraspecific variability in response to water availability. For example, stomatal conductance or its indirect measurements by thermal imaging, net CO2 assimilation rates, leaf photochemistry and other biomass and morpho-functional traits are good indicators of plant sensitivity to water deficit. The analysis of these functional traits enables to explore the main underlying mechanisms of the plant in response to water availability and can be used to summarize the different drought response strategies developed by different cultivars. In a complementary way, the analysis of phenotypic plasticity, contributes to a more complete knowledge on the adaptation capacity of the cultivar under certain environmental scenarios. Garlic (Allium sativum L.) is the second most cultivated species of the genus Allium worldwide. However, despite its importance, the degree of inter-cultivar variability of key functional traits and its relationship with the bulb production capacity in response to water availability remains largely unknown. Garlic is cultivated in many arid and semi-arid regions.

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