Neiker-Tecnalia studies the effects of climate change on Tempranillo grape wines

April 30, 2014

Climate change is set to affect the quality of the wines of the Tempranillo grape variety, according to the conclusions of a piece of research conducted by the Basque Institute for Agricultural Research and Development Neiker-Tecnalia, in collaboration with the University of Navarre and the Aula Dei (EEAD) Experimental Station of the National Council for Scientific Research (CSIC). Scientists from these bodies have studied the behaviour of the vines in conditions of climate change; in other words, higher temperature, increased presence of CO2 and greater environmental aridity. The result is a must with a lower anthocyanin content, which leads to wines with less colour and therefore lower quality. The results of the research, led by the agricultural engineer Urtzi Leibar, have been presented at the conference of the European Geosciences Union (EGU), held in Vienna (Austria).

The research has been conducted in a greenhouse environment with of the species 'Vitis vinifera cv. Tempranillo'. The three factors studied were , water stress of the plant and soil texture. To analyse the effect of climate change on the grapes, some vines were placed in conditions of a greater presence of CO2, and lower relative humidity, while other vines were situated in current climate conditions.

In addition to the CO2 and temperature changes, climate change is expected to cause a reduction in rainfall, with this rainfall being distributed across more extreme events. That is why the researchers subjected the vines to two different treatments. One with properly hydrated plants (20-35% of water content in the soil) and the other treatment consisted of plants subjected to water stress, and which were irrigated with 40% less water. As regards the soil, three different textures were studied with clay contents of 9%, 18% and 36%.

Among the most significant results as regards production and qualitative parameters, climate change was found to bring forward the grape harvest by nine days. This reduced the anthocyanin concentration, which resulted in red wines with less colour. It also caused an increase in the pH of the must. The pH level is a factor of interest for wineries, since it has to be low if the wines are going to be preserved optimally.

The water shortfall, for its part, delayed ripening –the grape harvest was carried out ten days later– and the growth of the vine was reduced. This fact also meant an increase in the pH of the must and a reduction in polyphenol content. Polyphenols are found in grape skin and pips and give wines aroma, colour and taste. As regards soils, the sandiest ones –with the lowest clay content– produced musts with a higher anthocyanin level, which yields wines with more colour.

Information of interest for the wine growing sector

The final aim of the study by Neiker-Tecnalia, the University of Navarre and the EEAD-CSIC is to make available information that will assist the wine growing sector in mitigating possible damage by the anticipated climate conditions or, where appropriate, to take advantage of the opportunities that may present themselves.

The climate is the factor that exerts the greatest influence on the suitability of a region for vine growing and wine production, since it directly affects the development of the vineyard and grape quality. Climate change is therefore an aspect that the sector needs to take very much into consideration.

The vineyard surface area across Spain amounts to 954,000 hectares, which is 5.6% of the total cultivated surface. The wine growing sector is an hugely important activity in terms of the economic value it generates, the population it employs and the role it plays in environmental conservation.

Explore further: Researchers study the effects of climate change on Tempranillo grape wines

Related Stories

Wine feels the effects of a changing climate

January 8, 2013

The signs of climate change are universally evident, but for French winemakers, already feeling the effects of competition from other countries, the year of volatile weather does not bode well. A lot of rain, a late spring ...

Sequencing study lifts veil on wine's microbial terroir

November 25, 2013

( —It's widely accepted that terroir—the unique blend of a vineyard's soils, water and climate—sculpts the flavor and quality of wine. Now a new study led by UC Davis researchers offers evidence that grapes ...

Grape vines in hot water

October 2, 2013

A tool to help growers and nurseries plant healthier grape vines has been developed by a Charles Sturt University (CSU) researcher.

Recommended for you

The strange case of the scuba-diving fly

November 20, 2017

More than a century ago, American writer Mark Twain observed a curious phenomenon at Mono Lake, just to the east of Yosemite National Park: enormous numbers of small flies would crawl underwater to forage and lay eggs, but ...

Chimp females who leave home postpone parenthood

November 20, 2017

New moms need social support, and mother chimpanzees are no exception. So much so that female chimps that lack supportive friends and family wait longer to start having babies, according to researchers who have combed through ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.