Understanding the impact of rising temperatures due to climate change on aromatic compositions in Malbec wines from Mendoza, Argentina
Mendoza is one of Argentina’s most important and outstanding wine regions producing the renowned Malbec wines due to its optimal soil and weather conditions. However, the effects of 21st-century climate change would negatively impact Malbec wines quality. This study investigated the effect of temperature increase and the impact of plant hormone abscisic acid (ABA) used to mitigate the negative effect of temperature increase on Malbec wines aromatic composition through GC-MS. Four treatments were applied on vines at field condition: Control, Control + 3 ºC, ABA and ABA + 3 ºC.
The principal component analysis (PCA) showed that the four treatments were separated at the level of aromatic compounds families. Wine from ABA treatment, without temperature increase, was characterized by high concentrations of volatile phenols, alcohols, and free C13-norisoprenoids. On the opposite side, wine of ABA treatment, with 3 ºC rise, was characterized by high concentration of C6-alcohols, terpenes and lactones. On the other hand, wine from control treatment with 3 ºC rise was located in the negative parts of both axes, showing a very low contents of all the compounds. While wine from control treatment without temperature increase showed higher concentration of C13-norisoprenoid, alcohols and volatile phenols vs control nevertheless lower than ABA. These results suggest that global warming has a negative impact on the aromatic composition of Malbec Argentinean wines, while ABA could play an important role as a mitigation tool.
Acknowledgements: H2020-MSCA-RISE-2019: vWISE Project, Number 872394. We also thank to ICVV analytical service.
Issue: ICGWS 2023
1Grupo de Fisiología Vegetal y Microbiología, Instituto de Biología Agrícola de Mendoza y Cátera de Fisiología Vegetal, Facultad de Ciencias Agrarias, CONICET-Universidad Nacional de Cuyo, Chacras de Coria, M5528AHB Mendoza, Argentina
2Instituto de Ciencias de la Vid y del Vino-ICVV (CSIC, UR, GR) Finca La Grajera, 26007 Logroño, La Rioja, España
3Universidad de La Rioja, Departamento de Agricultura y Alimentación, C/ Madre de Dios, 51, 26006 Logroño, La Rioja, España