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Universidade de Tras os Montes E Alto Douro (2020)

Ecophysiological and biochemical characterization of different varieties in Douro Region

Gedara, Nisanka Ambriz Kehel Kotuwe

Titre : Ecophysiological and biochemical characterization of different varieties in Douro Region

Auteur : Gedara, Nisanka Ambriz Kehel Kotuwe

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

Grade : Mestrado em Engenharia Agronómica 2020

Résumé
In recent years, there has been a change in climate in agriculture and, above all, in the wine sector, with the growing problem of global warming, with significant changes in viticulture, especially in the old wine world (Europe). This increase in temperature has already occurred in the Douro Demarcated Region (DDR) in recent years. Although the vine has several survival strategies, it is necessary to adopt adaptation and mitigation measures in the viticulture sector. The objective of this study was to evaluate one of the long-term adaptation measures to select the strains that are most resistant to the effects of summer stress, and to evaluate those that best fit the Baixo Corgo subregion DDR. For this purpose, 10 grape varieties located in the sub-region under study with an E-W orientation were chosen in the Ampelographic Field of the Professional School of Rodo, Peso da Régua in equal conditions and soil and water with the analysis of eco-physiological (leaf) and biochemical (fruit) parameters in two dates : August 23 and September 12 of 2018,. Relatively physiological response in midday period (more severe), the varieties that showed best response, are the Aragonês, TBarroca, TFranca and Touriga Nacional. Regarding biochemical parameters, Aragonês, TFranca and TNational varieties presented higher concentration of carbohydrates, phenolic compounds, anthocyanins and tannins. With results of this work we can conclude that, the varieties Aragonês and TBarroca are the varieties better adapted to this Terroir and the varieties Trincadeira and TFrancisca both proved to be less adapted to it. In conclusion, in view of the results, we can affirm that the selection of grape varieties in the grapevine, compared to other annual non-perennial crops such as cereals and vegetables, is a critical mitigation strategy due to the investment to be made that is generally much larger and the commitment is for a longer period of time and more difficult to reverse. Therefore, it should be well considered in the year of installation of the crop, because the strategy is more expeditious and the costs are lower.

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Page publiée le 26 mars 2021