RESUMO A desfolha no vinhedo tem como principais objetivos aumentar a radiação solar e a aeração na região dos frutos, para melhorar a coloração e a maturação das uvas tintas, além de reduzir a incidência de podridões, visando ABSTRACT The practice of partial defoliation in vineyards has as main objectives increase sunlight and ventilation for the fruit, aiming to improve color and maturity in red grapes and helping to reduce fungal diseases, which should result in better wine quality. The main aim of this research was to evaluate the effects of partial defoliation on the quality of Cabernet Sauvignon grapes and wines from Dom
RESUMO de 2007/2008, 2008/2009, 2009/2010, 2010 e 2011
SUMMARYThermaculture is applied in vineyards for fungus diseases prevention. However, it can also induce plant to thermal stress, modulating the secondary metabolism. Thus, it was determined the role of thermaculture on 'Cabernet sauvignon' wine sensory properties and anthocyanin profile by the application on the vineyard. A total of 19 applications from flowering to harvesting were made. After winemaking and aging (12 months), physicochemical analysis, anthocyanin characterization by high performance liquid chromatographic (HPLC-PDA-MS/MS), and sensory descriptive analysis were done. Treatment on grapes has increased 4.5% of total anthocyanins monomers, 29.4% of pyranoanthocyanins, and 29.5% of direct condensation products that were formed in wine. Thermaculture affected the sensory quality of wine since judges have perceived significant differences in visual (tear, red color) and gustatory (woody flavor) attributes. Finally, thermaculture is an innovative technology and a promising tool to increase anthocyanins in 'Cabernet Sauvignon' wines. RESUMOThermaculture é aplicada em vinhedos para prevenção das doenças fúngicas. Contudo, pode induzir a planta a um estresse térmico, modulando o metabolismo secundário. Assim, foi determinado o papel da thermaculture nas propriedades sensoriais e perfil das antocianinas do vinho 'Cabernet Sauvignon' pela aplicação na vinha. Foi realizado um total de 19 aplicações do florescimento à colheita. Após a vinificação e conservação (12 meses) foram realizadas análises físico químicas, caracterização das antocianinas por cromatografia líquida de alta eficiência (CLAE -DAD -EM/ EM), e análise descritiva quantitativa. O tratamento nas uvas aumentou 4,5% dos monômeros de antocianinas totais, 29,4% das piranoantocianinas e 29,5% nos produtos de condensação direta que se formaram no vinho. A thermaculture afetou a qualidade sensorial do vinho, uma vez que os julgadores perceberam diferenças significativas nos atributos visuais (lágrima, cor vermelha) e gustativos (sabor amadeirado). Finalmente, a thermaculture é uma tecnologia inovadora e uma ferramenta promissora para aumentar as antocianinas nos vinhos 'Cabernet Sauvignon'.
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