According to a report circulated today by the Italian media, researchers at the University of Verona have completed mapping of the DNA contained in the Corvina grape variety, the main grape utilized in the production of wines from Valpolicella, including dried-grape wines Amarone and Recioto. The decoding marks the first time ever, according to the report, that DNA has been mapped for an indigenous Italian grape variety.
Researchers Massimo Delledonne and Mario Pezzotti were able to confirm what they already suspected: the Corvina grape contains genes that become active when the fruit is exposed to “hypo-hydraulic stress,” i.e., water deprivation during the drying process (called appasimento in Italian). These genes, which are absent in other red grapes like Pinot Noir, help to create and preserve the characteristic aromas and flavors of Amarone as the berries are dried.
