Microvinifications in wild grapevine relic populations of Spain and France

Abstract

The microvinification of nine Eurasian wild grapevine populations situated in different habitats in La Rioja (Spain) and the Basque Country (Spain, France) were carried out. Populations were observed at flowering time in order to assess the presence of male and female vines. Both harvests took place during the last week of October and the first week of November in 2015 and 2016. Bunches were destalked by hand selecting only ripe grapes, pressed and the amount of must in each sample was weighed. The mixture of must with seeds and skins were fermented at 20oC with native yeasts without the addition of Potassium metabisulphite. The principal objective was to determine the main oenological characteristics of these wild wines. Due to the small size of the grapes and the fact that their seeds (1 or 2) are quite bulky, the volume of must obtained is very low in each microvinification (15.3 and 16.7 % in weight). In 2015, they showed higher values of alcoholic concentration, lower total acidity and higher pH than with the wines of the year 2016 because berries were more mature 59 Microvinifications in wild grapevine Munibe, Cienc. nat. 68, 2020 • pp. 59-75 • Donostia/San Sebastián • ISSN 0214-7688 • eISSN 2172-4547 Carlos A. Ocete1, Rafael Ocete1, María C. Ayala2, José María del Río3, Miguel Lara4, Juanjo Hidalgo5*, José M. Valle6, Álvaro Rodríguez-Miranda6 Microvinifications in wild grapevine relic populations of Spain and France. Microvinificaciones de poblaciones relictas de vid silvestre de España y Francia. 1 Freelance, Tirgo (La Rioja) (Spain) 2 Instituto La Laboral, Lardero (La Rioja) (Spain) 3 Bodegas Ramón Bilbao (Haro, La Rioja) (Spain) 4 IFAPA “Rancho de la Merced”, Jerez de la Frontera (Cádiz) (Spain) 5 Laudioalde Lanbide Eskola & Aunia Kultura Elkartea (Álava) (Spain) 6 Universidad del País Vasco (UPV/EHU), Escuela Universitaria de Ingeniería, Vitoria-Gasteiz, Spain * Corresponding author: juanjoaunia@gmail.com https://doi.org/10.21630/mcn.2020.68.06 Art 4.qxp:Maquetación 1 18/12/20 12:46 Página 59