VINEYARD MANAGEMENT TO OPTIMIZE GRAPE QUALITY IN VIRUS-FREE CLONES OF VITIS VINIFERA L.

The potential of visible-near infrared (vis/NIR) spectroscopy (400 nm to 1100 nm) for classification of grape berries on the basis of multi inner quality parameters was investigated. Stored Vitis vinifera L. cv. Manicure Finger and Vitis vinifera L. cv. Ugni Blanc grape berries were separated into three classes based on the distribution of total soluble solid content (SSC) and total phenolic compounds (TP). Partial least squares regression (PLS) was applied to predict the quality parameters, including color space CIELAB, SSC, and TP. The prediction results showed that the vis/NIR spectrum correlated with the SSC and TP present in the intact grape berries with determination coefficient of prediction (RP2) in the range of 0.735 to 0.823. Next, the vis/NIR spectrum was used to distinguish between berries with different SSC and TP concentrations using partial least squares discrimination analysis (PLS-DA) with >77% accuracy. This study provides a method to identify stored grape quality classes based on the spectroscopy and distributions of multiple inner quality parameters.

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"Terroir" effect, as a result of enviromental stess, depends more on soil depth than on soil type (Vitis vinifera L. cv. Grenache Noir, Côtes du Rhône, France, 2000)

OENO One ◽

10.20870/oeno-one.2006.40.4.867 ◽

2006 ◽

Vol 40 (4) ◽

pp. 177 ◽

Cited By ~ 2

Author(s):

Jacques Coipel ◽

Begoña Rodriguez Lovelle ◽

Catherine Sipp ◽

Cornelis Van Leeuwen

Keyword(s):

Vitis Vinifera ◽

Soil Type ◽

Soil Depth ◽

Soil Types ◽

Vitis Vinifera L ◽

Anthocyanin Content ◽

Nitrogen Status ◽

Grape Quality ◽

Shallow Soils ◽

Berry Composition

Among other elements of the natural environment, soil greatly influences vine behaviour and berry composition. Its influence is complex, because soil affects vine water and mineral uptake, as well as temperature in the root zone. In this research, investigations were undertaken to assess whether vine development and grape quality potentiel could be linked to specific soil types. 15 dry farmed plots planted with Vitis vinifera L. cv. Grenache noir were studied in 2000 on five soil types of the Southern Côtes du Rhône (France). No clear relationship could be established between soil type, vine growth, yield and berry composition. However, vine water and nitrogen status were related to soil depth. On shallow soils, vine water and nitrogen status were low, which resulted in early shoot growth cessation and moderate yield, as well as high berry sugar and anthocyanin content. Severe water stress is known for affecting negatively berry ripening. Nevertheless, although this study was carried out under dry, Mediterranean conditions, the grapes with the highest potential for making quality red wines were obtained on the soils with the lowest water holding capacity.

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Effects of cluster thinning on anthocyanin extractability and chromatic parameters of Syrah and Tempranillo grapes and wines

OENO One ◽

10.20870/oeno-one.2009.43.1.786 ◽

2009 ◽

Vol 43 (1) ◽

pp. 45 ◽

Cited By ~ 2

Author(s):

Rocío Gil-Muñoz ◽

Rosario Vila-López ◽

José Ignacio Fernández-Fernández ◽

Adrián Martínez-Cutillas

Keyword(s):

Vitis Vinifera ◽

Alcoholic Fermentation ◽

Climatic Conditions ◽

Vitis Vinifera L ◽

Grape Quality ◽

Cluster Thinning ◽

Commercial Vineyard ◽

Better Than

Aims: The effects of cluster thinning on yield and extractability parameters of Syrah and Tempranillo grapes, as well as the chromatic characteristics of the wines obtained in three consecutive seasons.Methods and results: Grapes of Vitis vinifera L. var. Tempranillo and Syrah were harvested from a commercial vineyard in Jumilla. Two treatments were evaluated: (a) cluster thinned, where in every shoot all the clusters, except the basal one, were removed just before veraison; (b) unthinned control. Yield, physicochemical and extractability parameters were studied in the grapes. Vinifications were made from these grapes, and chromatic parameters were studied at the end of alcoholic fermentation. Results showed that cluster-thinned vines performed better than control vines during the three consecutive years of the experiment, although the best results were obtained in the driest year (2005). The Syrah variety always provided better results than the Tempranillo variety. The cluster-thinning treatment also influenced the chromatic characteristics of the wines obtained.Conclusions: The results showed that thinning successfully reduced yield and produced an earlier harvest in the two varieties studied. The grape quality improved and, in general, wines made from cluster-thinned vines of both Syrah and Tempranillo had significantly better chromatic characteristics than control wines.Significance and impact of the study: This study demonstrate that the practice of cluster-thinning may be recommended depending on several factors, as the varieties and the climatic conditions play also a role in the extractability parameters of grapes, and therefore its use cannot be generalized.

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Effects of Arthrospira platensis Extract on Physiology and Berry Traits in Vitis vinifera

Plants ◽

10.3390/plants9121805 ◽

2020 ◽

Vol 9 (12) ◽

pp. 1805

Author(s):

Linda Salvi ◽

Alberto Niccolai ◽

Eleonora Cataldo ◽

Sofia Sbraci ◽

Francesca Paoli ◽

...

Keyword(s):

Water Stress ◽

Vitis Vinifera ◽

Arthrospira Platensis ◽

Vitis Vinifera L ◽

Negative Consequences ◽

Optimal Conditions ◽

Gas Exchanges ◽

Grape Quality ◽

Leaf Gas Exchanges ◽

Berry Composition

Several advantages on physiology, productivity, and grape quality have been reported for grapevine treated with seaweed extracts, but little is known about the importance of cyanobacterial-based biostimulants in viticulture. The purpose of this pioneering work was to analyze the broad-spectrum effects of the Arthrospiraplatensis F&M-C256 extract on Vitis vinifera L. cv. Pinot Nero grown in pots in optimal conditions and under water stress. To evaluate the effects, major physiological parameters of the plants and the quali-quantitative parameters of grape were analyzed. According to the results obtained in this study, ameliorating effects in leaf gas exchanges induced by A. platensis F&M-C256 treatments were detected in both irrigation regimes. Above all, A. platensis F&M-C256 allowed keeping stomata open without negative consequences in water potential in treated vines under water-stress conditions. In terms of berry traits, A. platensis F&M-C256-treated vines presented higher berry weight in comparison with untreated vines in both water regimes and improved berry composition in treated vines subjected to drought. The results of the present study demonstrated an A. platensis-dependent physiological response in case of abiotic stress, which prominently affects grape traits at harvest.

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