Molecular characterization of a variegated grapevine mutant cv Bruce’s Sport

During aging, wine consumes small amounts of oxygen. This oxygen intake triggers a series of reactions that lead to flavonoid elongation, which is known to reduce bitterness and astringency while enhancing color stability.

Double cropping is a novel technique, driven by the extension of the growing season caused by global warming.

Wine flavanols are extracted from grape skin and seeds along red winemaking. Potentially, eight flavan-3-ol subunits may be present as monomers or as tannins constituents, being these catechin, epicathechin, gallocatechin, epigallocatechin end the gallates of the mentioned units. In this work the flavanol profiles of grape skins and seeds before (grapes) and after (pomace) red winemaking were studied together with the one in the corresponding wines. The trials were made over two vintages in Vitis vinifera cv. Tannat, Syrah and Marselan from Uruguay.

Grape phylloxera (GP) (Daktulosphaira vitifoliae Fitch, 1855) devastated European vineyards in the 19th century by attacking Vitis vinifera roots. Today, grafting onto resistant American rootstocks remains its primary control strategy, but GP continues to threaten non-grafted vineyards, prompting the search for alternative control solutions.

Context and purpose of the study. Climate change in many Mediterranean wine-growing regions is resulting in lower rainfall and higher reference evapotranspiration, generally leading to reduced water availability for vines.