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Effects of time variable water deficit, defoliation and crop load reduction on the juice and wine composition of Vitis vinifera L. cv. Solaris, analysed by FT IR Spectroscopy and 1 H NMR Spectroscopy
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Resumo(s)
Water
deficit at different tim es during the phenological cycle was induced in pot grown Vitis vinifera L.
cv. Solaris while severe de fo liation and severe crop load reduction was carried out in field grown Solaris
plants. Juice and wine samples were obtained by all treatment groups and me asured by Fourier
Transform Infrared (FT IR) Spectroscopy and Proton Nuclear Magnetic Resonance 1 H N MR
Spectroscopy. Chemometric data analysis was performed by PCA on a variety of different data sets.
Water stress timing did not alter the composition of juice and wine in Solaris compared to an irrigated
control group, but pruning type showed an influenc e on composition S ingle cane pruned vines show ed
a tendency to higher values in most examined parameters when compared to double cane vines. A
clear sampl e distribution was visible among the field groups. Crop thinning proved to be a reliable
practice to in crease sugar content and ripeness parameters while defoliation showed a decreasing effect
on sugar accumulation and ripeness and an increasing effect on tartaric acid. 1 H NMR was found to be
a useful tool to differentiate between the samples of the two e xp eriments in both juice and wine and
metabolites responsible for this sample distribution could clearly be identified by PCA. NMR based
metabolomics are c oncluded to be a promising technique for future wine research.
Descrição
Vinifera Euromaster - European Master in Viticulture and Oenology Engineering / Instituto Superior de Agronomia. Universidade de Lisboa / University of Copenhagen
Palavras-chave
grapevine water stress defoliation crop thinning 1H-NMR
Contexto Educativo
Citação
Nittnaus, A.P. - Effects of time variable water deficit, defoliation and crop load reduction on the juice and wine composition of Vitis vinifera L. cv. Solaris, analysed by FT IR Spectroscopy and 1 H NMR Spectroscopy. Lisboa: ISA, 2019, 106 p.