Grape berry splitting results from excessive tensile stress that builds on the skin. The thin shell theory describes splitting resistance of grape berries as the maximum internal pressure at the point of splitting. Quantifying this relationship in genetically diverse Merlot, Syrah, Zinfandel, and Concord grapes enabled us to determine cultivar differences and understand developmental changes in splitting resistance.
In contrast to malic acid, few studies relate to the metabolism of tartaric acid (TA) under abiotic stress in ripening berries. TA biosynthesis is well known with its metabolism believed to be limited from berry set until véraison and therefore not impacted by ripening conditions.
Gene expression and phenotypic characteristics of plants grown in contrasting environments can be modulated through different epigenetic mechanism such as DNA methylation. This epigenetic mark may act in a dynamic way in response to different environmental conditions were high altitude vines are developed.
In recent years, sunburn has become a major concern to viticulture throughout the world. Given that grapevines differ in heat tolerance, the incidence of sunburn is likely to vary among different cultivars.
There is an increasing interest by the wine industry to know the performance of new winegrape cultivars in traditional areas to find out which cultivars could better complement the traditional wines. In warm areas, isohydric cultivars and high yields are sought in order to save water and to delay maturity.
En Vitis sp., la resistencia al frío (RF) adquirida durante la estación de dormición (ED) es crucial para la supervivencia y el rendimiento. La mayoría de la información sobre RF es obtenida en áreas cercanas a 40°N, donde las temperaturas causan daños recurrentes en viñedos.
In tropical regions, grapevine plants are not usually exposed to extreme low temperatures over the production cycle. As a result, bud break is nonuniform and sprouting is inconsistent. To cope with this, Hydrogen Cyanamide (Dormex®) is used to break bud dormancy and provide uniformness to the vineyard.
Ethephon is known to be a growth regulator that, when applied to the plant, is metabolized into ethylene. In this study, it has been evaluated the foliar application at the beginning of veraison of a commercial product (Fruitel 180, 18% w/v ethephon) in a Vitis vinifera L. cv. red Tempranillo vineyardin La Rioja (north of Spain).
Grapevine production in Chile is facing increasing water deficit problems related to aridization. We studied the use of rootstocks as a strategy for enhancing the performance of cv. Syrah (Sy) and Cabernet Sauvignon (Cs) grapevines under water deficit.
Grapevine leafroll associated virus 2 (GLRaV-2) is one of the most common damaging viral diseases in vines, causing significant reductions in photosynthesis, yield and grape quality. In this study, we tested the hypothesis that the leaf net photosynthesis and the transport of sugars to the berries is progressively reduced along the season in vines infected with GLRaV-2, and consequently, the yield (kg per plant) and total soluble solids (TSS) at the berry harvest-ripe stage are lower than non-infected vines.
For the west of Argentina, vitiviniculture represents the main agricultural industry. In the irrigated valleys where viticulture is developed, the problems of salinity and toxicity of some ions in the soil limit productivity and quality of the obtained products. The tolerance to toxic ions (Cl-, Na+, B (OH)4-) of the commercial grape cultivars is rather low, but it is feasible to use rootstocks that withstand high levels of ions in the soil through different mechanisms.
Malbec is the most important grape variety cultivated in Argentina. In Mendoza, at 1450 m asl, the intensity of natural ultraviolet-B (UV-B) radiation is high and causes a significant increase on polyphenol content in berries.
Different irrigation treatments were applied in vines (Vitis vinifera L.) with cv. Tempranillo blanco during 2016 in an experimental field located in Rincón de Soto (La Rioja, Spain), 42°12'37"N; 1°52'36"W.
According to IPCC, in 2001-2010 floods have been the most frequent extreme event. Root exposure to prolonged hypoxic conditions produced by temporary flooding of the soil, may induce the synthesis of stress hormones, the production of reactive oxygen species and undergo metabolic re-programming.