Climate change on V. vinifera L. cv. Malbec. Temperature increase and water restriction effect on the wines composition in a field study over three consecutive years

DEIS LEONOR; MALOVINI, EMILIANO; SARI, SANTIAGO; DURAN, MARTIN; MARTINEZ L.; MARIA TERESA PONCE; J. B. CAVAGNARO; DE ROSAS I.; ARANCIBIA, CELESTE; BORGO, ROBERTO

Verona

Simposio; X International Symposium on Grapevine Physiology and Biotechnology; 2016

Universita di Verona, Departamento di Biotecnologie

The 2013 Intergovernmental Panel on Climate Change report predicts for the late XXI century a temperature increase (TI) between 2 and 6°C, given the current scenario. Argentinean studies forecast an increase of 3-4°C, in 100 years, for the Argentinean Cuyo region. Several researchers report under different simulation methods that TI is detrimental for anthocyanins production in some varieties while post-veraison water restriction (WR) stimulates its synthesis in grape skins. In this field study we tested a TI of 2-3°C on V.vinifera cv. Malbec grapes quality with WR as a palliative. To achieve TI in the vineyard, an air passive heating open chamber was located under the canopy. The results obtained in the wines from the 2012, 2013 and 2014 cycles showed a higher effect in the 2013 and 2014 cycles. For the TI wines, total acidity was lower and alcohol higher but WR did not have a significant effect. Regarding color, the color index decreased and there was an increment in anthocyanin hue. Total, co-pigmented and free anthocyanins also decreased under TI. In these variables, E did not have its expected effect. This 3 consecutive cycle study shows that, under these experimental conditions, a TI of 2-3°C has negative effects on the wine quality in cv. Malbec that can not be countered by WR.