University of Pisa Study Finds UV-C Light Boosts Wine Color and Aroma in Vineyards

A recent study by the University of Pisa, conducted in collaboration with Ornellaia, one of Tuscany’s leading wineries, has found that targeted applications of ultraviolet (UV-C) light in vineyards can improve both the color and aroma of wine. The research was carried out in the Cabernet Sauvignon vineyards at Tenuta dell’Ornellaia, located in Bolgheri and part of the Frescobaldi Group. The study was published in the scientific journal “Plants.”

The research team, led by Claudio D’Onofrio, professor of viticulture at the University of Pisa, applied additional UV-C light to grapevines during the ripening phase. The results showed that this treatment stimulated the plants to produce higher levels of anthocyanins and flavonols. These natural compounds are responsible for giving wine a more intense and stable color over time, as well as contributing to its aromatic complexity.

The use of UV-C light in vineyards is not new. It is already used to control diseases such as mold and downy mildew, helping to reduce the need for chemical treatments. However, this study explored a different protocol by applying a few targeted UV-C treatments during grape maturation. The goal was to increase the concentration of secondary metabolites in the fruit without significantly affecting plant growth or grape yield.

D’Onofrio explained that previous studies had shown UV light could stimulate plants to produce molecules linked to wine quality, but these effects were mostly observed in laboratory settings. This new research demonstrates that similar benefits can be achieved under real vineyard conditions. According to D’Onofrio, “We have shown that it is possible to enhance the color and aroma of grapes without compromising production levels. This is an interesting result because it uses existing technology in a more conscious and targeted way.”

The findings suggest that UV-C light could become an additional tool for improving grape quality while reducing the environmental impact of viticulture. By increasing the quality of grapes through non-chemical means, growers may be able to use fewer pesticides and fungicides. This approach aligns with current industry goals to combine sustainability, innovation, and high quality amid increasingly challenging climate conditions.

The study’s results are particularly relevant as winemakers face growing pressure to adapt their practices due to climate change and stricter environmental regulations. The ability to enhance grape quality without major changes to traditional farming methods or reductions in yield could offer a practical solution for many producers.

Researchers at the University of Pisa plan to continue studying how UV-C technology can be integrated into vineyard management on a larger scale. They hope further trials will confirm these initial findings and help develop guidelines for its use across different grape varieties and growing regions. The collaboration with Ornellaia highlights how partnerships between academic institutions and leading wineries can drive innovation in the wine industry while maintaining a focus on sustainability and product excellence.