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Advisor(s)
Abstract(s)
Viticultural practices and irrigation have a major impact on fruit development and yield,
and ultimately on must quality. The effects of water deficit (WD), defoliation (Def), and crop-thinning
(CT) on Solaris plants and fruit development, as well as on the chemical composition of grape
juice were investigated. WD was induced at three periods during fruit development (pre-veraison,
veraison, and ripening) in pot-grown plants, while Def and CT were carried out on field-grown
plants. Environmental and vegetative parameters were monitored during the experiments. The bulk
chemical composition of the fruits was determined in juice by Fourier Transform-Infrared (FT-IR)
spectroscopy throughout fruit ripening and at final harvest. The results showed that WD reduced
soil water content and leaf water status. CT significantly reduced yield per vine, but increased cluster
size. Mid to late WD reduced soluble solids by 1%. CT increased sugar content in juice, while Def
decreased sugar accumulation. Total acids were higher in the juice from the field vines. Yet, CT
lowered malic and tartaric acids. Def increased tartaric acid. Ammonia and alpha amino nitrogen
were higher in the juice from pot-grown vines, while pH was lowered by Def and raised by CT.
It is concluded that Solaris has a remarkable ability to tolerate and recover from WD. CT and Def
significantly affected the bulk chemical composition of grapes in terms of total acidity and sugar
accumulation, with CT grapes having the highest sugar content and the lowest total acidity and Def
the opposite
Description
Keywords
Vitis vinifera Solaris grapevine climate change water stress defoliation crop-thinning FT-IR bulk grape metabolome
Pedagogical Context
Citation
Aru, V.; Nittnaus, A.P.; Sørensen, K.M.; Engelsen, S.B.; Toldam-Andersen, T.B. Effects of Water Stress, Defoliation and Crop Thinning on Vitis vinifera L. cv. Solaris: Part I: Plant Responses, Fruit Development and Fruit Quality. Metabolites 2022, 12, 363
Publisher
MDPI