Percorrer por autor "Mota, Natalia"
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- Foliar Silicon Application in the Era of Climate Change as a Part of Strategy to Reduce Water Requirements in Mediterranean ViticulturePublication . Dinis, Lia Tânia; Mota, Natalia; Martins, Sandra; Ribeiro, A.C.; Moutinho-Pereira, José; Pereira, SandraRising temperatures and water scarcity due to climate change are significant challenges for Mediterranean viticulture, particularly in the Douro Valley, a prominent winemaking region. Silicon (Si) has gained attention as a potential solution for mitigating these environmental stresses, especially in areas with limited water resources. This study explores the foliar application of Si as a promising strategy to reduce water requirements in vineyards, specifically for the Touriga Franca variety, thereby supporting more sustainable water use. Four treatments were tested: nonirrigated control (C−), an irrigated control under a deficit irrigation regime (25% ETc; C+), and two Si concentrations (7% Si-Si1 and 20% Si-Si2) applied to non-irrigated plants. Results demonstrate that Sitreated plants improved physiological resilience, as evidenced by enhanced photosynthetic efficiency, greater water-use efficiency, and higher biochemical quality in both leaves and berries. Additionally, Si application increased leaf flavonoids and simultaneously improved must composition due to its overall influence on vine physiology, indicating its potential as a sustainable alternative to irrigation for reducing summer stress. This research suggests that foliar Si application could be a valuable, eco-friendly strategy to support sustainable viticulture under increasingly arid conditions, reducing the irrigation needs.
- Silicon application effect on berry quality of Touriga Franca variety in the Douro Demarcated RegionPublication . Mota, Natalia; Ribeiro, A.C.; Moutinho-Pereira, José; Dinis, Lia TâniaThe warmer and drier climate will challenge Portuguese viticulture negatively impacting the economy, particularly for renowned winemaking regions such as the Douro Demarcated Region. In the context of climate change, the production of grapes and the sustainability of the vineyard are vulnerable to the effects of high radiation, heat and drought during the summer period. These conditions affect negatively the vines at the phenological, physiological and biochemical levels. The shortage of water resources makes irrigation practically unsustainable from an economic and environmental point of view, being crucial to implement alternative and eco-friendly measures for a better balance between vines and the environment, helping to mitigate the effects of climate change. In this work, we applied a suspension of silicon (2.5 %) in a commercial vineyard located in the Douro Superior sub-region (Santa Comba da Vilariça) to understand its effects on increasing tolerance to water stress in Touriga-Franca cv. grapevines. The experiments were divided into three treatments: i) positive control - with a deficit irrigation (25% of ETc), ii) negative control - without irrigation and iii) silicon - SiO2, applied in pré veraison. After the statistical analysis, the results showed that at veraison silicon treated plants presented fruits with higher significant values of total phenols, pH and brix°, when compared with both irrigated and non-irrigated ones. At maturation, the silicon treated plants showed fruits with higher anthocyanins, alcohol, pH and brix° content than the negative control. Accordingly, we can suggest that silicon foliar treatment could be an alternative to deficit irrigation strategies to mitigate water stress without negative impact on berry quality.