Journal International des Sciences de la Vigne et du Vin (J INT SCI VIGNE VIN )


Discontinued in 1999.

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    ABSTRACT: Aims: To determine the anthocyanin composition in Carignan and Grenache grapes and wines as affected by vintage, plant vigor and bunch uniformity. Methods and results: Anthocyanin composition of Carignan and Grenache grapes and wines were analysed by chromatographic techniques considering the influence of two different vigor levels over two vintages. The heterogeneity in the distal parts of the bunch was also taken into account. Warm vintage was better for the accumulation of anthocyanins. However, each variety responsed differently according to vine vigor. Grenache anthocyanin synthesis decreased in low vigor (weak) vines, whereas Carignan anthocyanin content depended on vigor, berry size, rootstock and vintage. In both varieties, but more significantly in Carignan, there was a tendency to accumulate acylated anthocyanins in bottom berries. Conclusion : Carignan anthocyanin concentration was increased in low vigor plants, where clusters received greater sun exposure, unlike Grenache, where better canopy management in the fruit zone is necessary. Avoiding the poor growing conditions for Grenache in the region and improving the canopy/fruit ratio deserves careful consideration in order to reach optimal anthocyanin content. Significance and impact of the study : Knowledge of anthocyanin accumulation according to both plant vigor and bunch ripeness is of major importance to determine the optimal harvest date for each cultivar and thus improve the quality of wine.
    Journal International des Sciences de la Vigne et du Vin 09/2014; 48(3):201.
  • Journal International des Sciences de la Vigne et du Vin 01/2014;
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    ABSTRACT: Aims: A water stress index based on a water balance model was tested as a tool for classifying the water stress paths experienced by grapevines in various French Mediterranean vineyards. The relations between the index value and grapevine yield and berry quality (sugars, organic acids, anthocyanins) at harvest were investigated. Methods and results : A data set of 102 situations, each combining one location, one variety, one vintage and one water regime (irrigation or, most often, no irrigation), was collected for the study. The Fraction of Transpirable Soil Water (FTSW) was simulated by a unique-soil-reservoir water balance model at a daily time step. Five classes of water deficit were delimited from specific decreasing thresholds of FTSW over four periods between flowering and harvest. These thresholds were derived from predawn leaf water potential values because over decades, grapegrowers and researchers have shared references and built expertise by using this variable throughout the Mediterranean region. A water stress index resulting from the levels of water deficit reached at each of the four periods of the cycle was calculated. This index was correlated with yield per vine, berry weight, and berry sugar and organic acid contents but not with berry anthocyanin content. Conclusion : A simple water stress index, based on the water balance model, exhibited significant correlations with yield and berry quality for various cultivars and pedo-climatic conditions in Mediterranean vineyards. Significance and impact of the study : This water stress index is a valuable tool for explaining the variations in grape yield and quality of grape among various locations and years because it reflects the vineyard water stress history, in relation to rainfall regime and soil conditions. Improvement would come from the simulation of FTSW during winter, notably for soils of high Total Transpirable Soil Water. One potential application is the quantification of water stress change brought by irrigation in Mediterranean vineyards, and its relation to grapevine production.
    Journal International des Sciences de la Vigne et du Vin 01/2014; 48(1):1-9.
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    ABSTRACT: Aim: Grapevine is a traditional crop in Asturias (northern Spain). However, an important part of the varietal heritage of this region is still unknown. Great biodiversity was reported in previous surveys, with varietal identification being carried out via microsatellite markers. The aim of the present study was to confirm the previous genetic identification and provide the first description of the unknown cultivars. Methods and results : Forty cultivars were described in situ over a two-year period through 58 ampelographic descriptors. A model description was performed for each cultivar and great variability was found : white, red and rosé grape cultivars ; hybrids ; winemaking and dual-use (wine and table grapes) cultivars ; and some teinturier cultivars. Cluster analysis grouped cultivars with similar characteristics. Conclusion : Ampelographic description was complementary to molecular identification in confirming the identity of the studied cultivars. Moreover, unknown cultivars have been described for the first time. Complete characterization is necessary because these cultivars constitute valuable genetic resources for crop breeding programmes. Significance and impact of the study : Considering the limited number of accessions of the unknown cultivars and the replanting of old vineyards with vines approved by Cangas Quality Wine regulations, their conservation and study is vital to provide genetic resources for potential breeding or technological purposes in the future.
    Journal International des Sciences de la Vigne et du Vin 12/2013; 47(4):249-259.