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Accueil du site → Doctorat → Portugal → Biologia das culturas mediterrânicas num contexto de alterações climáticas : estudo de caso em Vitis vinifera L.

Universidade de Tras os Montes E Alto Douro (2017)

Biologia das culturas mediterrânicas num contexto de alterações climáticas : estudo de caso em Vitis vinifera L.

Gonçalves, Diana Marta Nogueira

Titre : Biologia das culturas mediterrânicas num contexto de alterações climáticas : estudo de caso em Vitis vinifera L.

Auteur : Gonçalves, Diana Marta Nogueira

Université de soutenance : Universidade de Tras os Montes E Alto Douro

Grade : Doutoramento em Ciências da Terra e da Vida 2017

Résumé partiel
In a near future, as a result of global climate change, it is increasingly accepted that the climate of the most important world viticultural areas will become significantly warmer and dryer, which may result in decreased economic viability of grapevine (Vitis vinifera L.) cultivation. Vineyards are traditionally non-irrigated, especially in Europe, and widely spread across dry and semidry regions, being mostly explored by winemaking industry. Yield and berry quality strongly depend on vine adaptability to drought. Understanding and controlling plant-water relationships and water-stress resistance by means of physiology and molecular biology can significantly improve plant productivity and environmental quality. Therefore, not disregarding the usefulness that irrigation may have in grapevine growth and development, the implementation of mitigation strategies is crucial, not only in economic terms, but also in terms of yield, quality attributes and environmental sustainability. Among these measures, a great effort has been carried out by the scientific community to study the application of substances in optimizing light microclimate, leaf water relations, yield, grape and wine quality. The trial was carried out from 2011 to 2012 with grapevines located in Vila Real (Campus of UTAD, 41°17’N, 7°44’W, 470 m asl, Baixo Corgo sub-region of Demarcated Douro Region, Northern Portugal). Grapevines from the same clone of Vitis vinifera L. cv. Touriga Nacional were installed in pots, on a total of 100 pots in 2011 e 60 in 2012. The plants were conditioned to two types of irrigation : I-field capacity (CH), and II- 1/3 field capacity (SH). The irrigation system was installed and controlled in all pots. The treatments were applied on the leaves by pulverization, and were salicylic acid, bordeaux mixture, kaolin in two different concentrations (3% and 6%) and silicon in the first year (2011). In the second year were applied kaolin at 5% concentration and bordeaux mixture. In both years there was a control group in each irrigation condition. Each group of treatment consisted of ten plants. Salicylic acid has proved his beneficial effect in many parameters, including the improvement of gas exchanges, the photochemical efficiency of PSII, the increase in concentration of photosynthetic pigments and soluble sugars and the reduction of thiobarbituric acid reactive substances (TBARS) concentration.

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