Caccavello, Giulio (2015) Vine performance and berry, must, and wine composition in response to different summer pruning and irrigation strategies in Vitis vinifera L. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Vine performance and berry, must, and wine composition in response to different summer pruning and irrigation strategies in Vitis vinifera L.
Creators:
CreatorsEmail
Caccavello, Giuliogiulio.caccavello@unina.it
Date: 31 March 2015
Number of Pages: 96
Institution: Università degli Studi di Napoli Federico II
Department: Agraria
Scuola di dottorato: Scienze agrarie e agroalimentari
Dottorato: Scienze e tecnologie delle produzioni agro-alimentari
Ciclo di dottorato: 27
Coordinatore del Corso di dottorato:
nomeemail
Barbieri, Giancarlobarbieri@unina.it
Tutor:
nomeemail
Basile, BorisUNSPECIFIED
Date: 31 March 2015
Number of Pages: 96
Uncontrolled Keywords: defoliation, shoot trimming, water stress, Aglianico, Bobal, Tempranillo, soluble solids concentration, titratable acidity, pH, alcohol concentration, phenolic ripening, wine sensory characteristics,
Settori scientifico-disciplinari del MIUR: Area 07 - Scienze agrarie e veterinarie > AGR/03 - Arboricoltura generale e coltivazioni arbore
Aree tematiche (7° programma Quadro): BIOTECNOLOGIE, PRODOTTI ALIMENTARI E AGRICOLTURA > Produzione sostenibile e gestione delle risorse biologiche della terra, della foresta e dell'ambiente acquatico
Date Deposited: 07 Apr 2015 08:19
Last Modified: 15 May 2018 01:00
URI: http://www.fedoa.unina.it/id/eprint/10456
DOI: 10.6093/UNINA/FEDOA/10456

Abstract

Soluble solids concentration measured at harvest in the berry juice has progressively increased over the last decades. This condition causes the production of high-alcoholic wine, whereas nowadays consumers tend to prefer wine with a low alcoholic degree. The aim of this dissertation was to define a vineyard management practice effective in reducing berry juice soluble solids concentration without affecting negatively other compositional parameters of the berry. Three experiments were designed: (1) the first aimed to assess the impact of two different intensities of post-veraison shoot trimming or defoliation on vine performance, berry composition, and wine quality on the red cultivar Aglianico; (2) the second experiment aimed to assess the impact of shoot trimming applied at three different stages of berry ripening on vine performance, berry composition, and wine quality on the red cultivar Aglianico; (3) the third aimed to assess the impact of post-veraison defoliation on vine performance and berry composition on two red cultivars, Tempranillo and Bobal, exposed to different irrigation strategies. For the first experiment, the following treatments were compared over three years (2012 - 2014) (a) two different intensities of post-veraison defoliation (50% and 75% of leaves located on laterals were stripped off); (b) two different intensities of post-veraison shoot trimming (vines were trimmed cutting off the portion above the 7th or 15th node); (c) one control non-defoliated and non-trimmed. Treatments were applied when soluble solids concentration in berry juice was around 12 °Brix. For the second experiment the following treatments were compared over two years (2013 - 2014): (a) three post-veraison shoot trimming applied at three phenological stages corresponding to berry soluble solids concentration of around 6, 12, or 18 °Brix; and (b) one non-trimmed control. From fruit set to harvest berry soluble solids concentration, pH, titratable acidity, and berry fresh and dry weight were assessed in both the experiments. In addition anthocyanin and polyphenol concentration of the berries were measured at harvest. Moreover, vegetative growth and net CO2 exchange rate were measured in different dates during the growing season. Moreover, canopy solar radiation interception was measured in the first experiment. After harvest, wines were made with the grapes of each treatment and after fermentation wine composition and wine sensory characteristics were assessed by a professional panel test. In the third experiment the following treatments were compared in 2014 (for both the cultivars): (a) vines irrigated and non-defoliated (I-ND), (b) vines irrigated and defoliated (I-D), (c) vines rainfed from pre-veraison to harvest and non-defoliated (NI-ND), (d) vines rainfed from pre-veraison to harvest and defoliated (NI-D). Defoliation was applied manually when the concentration of soluble solids was around 10 °Brix by stripping off six-seven main leaves (included leaves of laterals) from the upper part of the shoot. Berry soluble solids concentration, pH, the titratable acidity, the anthocyanin and polyphenols concentration; and the berry fresh weight and dry weight were regularly measured from leaf removal treatment to harvest. Moreover, vegetative growth, net CO2 exchange rate, stomatal conductance and Ψstem were monitored. Moderate pruning treatments determined a significant reduction in berry juice soluble solids concentration and wine alcoholic degree compared to control. Moreover, these practices improved wine sensory score. Intense pruning treatments allowed to reduce berry soluble solids concentration, but they could cause negative effects on yield components, berry composition, and wine quality. Irrigation and defoliation are two strategies effective in delaying berry sugar accumulation and wine alcohol degree, but the response to these practices depend strongly on the cultivar.

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