http://hdl.handle.net/10174/998 Mon, 06 Apr 2026 09:11:58 GMT 2026-04-06T09:11:58Z http://hdl.handle.net/10174/39639 Title: Exploring Opuntia ficus-indica as a Strategy to Mitigate High Temperatures Effects in Vineyards: Insights into Physiological and Proteomic Responses Authors: Rodrigues, L.; Santana, I.; Coelho, R.; Murta, G.; Cardoso, H.; Campos, C.; Barroso, J.M.; Rato, A.E. Editors: Li, Z. Abstract: High temperatures significantly impact grapevine growth and development and lead to severe losses in grape quality and production. To minimize the impact of those environmental constraints, the application of biostimulants (BSts) has emerged as one of the most interesting strategies. BSts application derived from cactus species has been described as a successful approach to enhance tolerance to biotic and abiotic stresses. In this study, an aqueous extract prepared from the cladodes of Opuntia ficus-indica was applied through foliar spraying to grapevine plants (Vitis vinifera L.) ’Aragonez’ already under heat stress. The effect of the extract application on protecting grapevine plants against heat stress was assessed in an experiment running during 15 days after extract application by determining several physiological parameters and detecting the changes in the whole proteome profile by comparing non-treated and extract-treated samples. Results show that physiological parameters directly related to photosynthesis showed a positive effect of the extract in mitigating heat stress in grapevines. Proteomic analysis indicated that the extract significantly upregulated proteins associated with photosynthesis and stress responses. This study provides new insights about the effect of O. ficus-indica extract in grapevines, offering a valuable strategy for future applications under field conditions. Sun, 30 Mar 2025 00:00:00 GMT http://hdl.handle.net/10174/39639 2025-03-30T00:00:00Z http://hdl.handle.net/10174/39637 Title: Wine Grapes Ripening: A Review on Climate Effect and Analytical Approach to Increase Wine Quality Authors: Rouxinol, M.I.; Martins, M.R.; Barroso, J.M.; Rato, A.E. Editors: Basile, A.; Maresca, V.; Cianciullo, P. Abstract: Red wine grapes have an important impact on the economy of many regions, both for wine quality and for their richness in phenolic compounds, which have many health benefits. Climate has been changing substantially in the last years, which affects greatly grape polyphenolic composition and wine quality. In this review, we will unveil the importance of climate in grape development, both physically and chemically, the different methodologies used to evaluate grape quality, the interesting new approaches using NIR spectroscopy, and the functional properties of grapes and red wine, due to their high phenolic content. Climate has an impact in the development of phenolic compounds in grapes, namely in the anthocyanins biosynthesis. The phenolic chemical composition changes during maturation, therefore, it is essential to keep on track the accumulation of these key compounds. This information is crucial to help producers choose the best harvest date since specific compounds like polyphenols are responsible for the color, taste, and mouthfeel of wines, which directly affects wine quality. The usage of different methodologies to assess quality parameters in grapes and wine, can be used to provide essential information to create the chemical profile of each variety to develop calibration methods. NIR spectroscopy seems to be a reliable method to be used in vineyards during grape maturation to provide real time information on quality parameters to producers since many reliable calibration models have been developed over time. Sun, 09 Jul 2023 23:00:00 GMT http://hdl.handle.net/10174/39637 2023-07-09T23:00:00Z http://hdl.handle.net/10174/39636 Title: Estudo sobre a origem do enrugamento do miolo da noz Authors: Farinha, D.; Mendes, M.; Barroso, J.M.; Peixe, A.; Dias, A.; Rato, A.E. Abstract: The Walnut tree (Juglans regia L.) is one of the most consumed nut species that has been gaining importance with the implementation of new orchards from north to south of the country. The incomplete formation of the seed (Kernel Shrivel) is one of the problems that most depreciates the quality and for which there isn’t an effective control due to its unknown origin. The accumulation of seed reserves that result in the development of the seed tissues, depends on several factors associated with the tree’s physiology. To understand the origin of this physiological anomaly in the walnuts, several parameters were evaluated: nutrient, fiber, fat and starch content in the branches. It was found that starch content in the branches seems to be the parameter that is most correlated with Kernel shrivel, with the less vigorous varieties (Lara and Howard) having a higher starch content and apparently a lower predisposition to the occurrence of this disorder. As these varieties have a lower percentage of shriveled kernels and are also less vigorous, there seems to be a correlation between the level of radiation received and the development of the seed. Thus, the higher level of radiation absorbed by these trees, may contribute to the lower predisposition of Kernel Shrivel. Wed, 02 Aug 2023 23:00:00 GMT http://hdl.handle.net/10174/39636 2023-08-02T23:00:00Z http://hdl.handle.net/10174/38247 Title: Avaliação da Operação 8.1.5 - Melhoria da resiliência e do valor ambiental das florestas- do PDR2020 no contexto da floresta portuguesa Authors: Camilo-Alves, Constanca Editors: Neto, Paulo Abstract: Quase metade (46%) da região do Alentejo é ocupada florestas, património natural que fornece serviços de ecossistemas além dos económicos diretos da sua exploração. Estas externalidades estão inseridas no Objetivo 15 da Agenda 2030 da ONU, o que justifica ações de valorização para a promoção da sustentabilidade. O PDR 2020 incluiu a Operação 8.1.5 “Melhoria da resiliência e do valor ambiental das florestas” concedendo investimentos florestais em ações sem retorno económico direto ou rápido, centrados na regeneração natural, mitigação do risco de incêndio e valorização de florestas autóctones de folhosas, carvalhais ou mistas. Este trabalho analisou os destinos principais dos investimentos aprovados, relacionando-os com a região e a espécie florestal a que se destinavam, através da identificação de palavras-chave para classificação da lista dos pedidos disponível. O investimento aprovado foi comparado com as medidas gerais conhecidas para a valorização ambiental, assim como as principais ameaças à floresta portuguesa. Identificou-se a ausência de regeneração que afeta a sustentabilidade, assim como o risco de incêndio da floresta e a aposta na sua mitigação. Destacam-se os pedidos para a valorização das florestas clímax, os ecossistemas florestais de alto valor ecológico, e sugere-se o reforço para este tipo de investimentos Sun, 01 Jan 2023 00:00:00 GMT http://hdl.handle.net/10174/38247 2023-01-01T00:00:00Z