Rebo was created in 1948 by an Italian agricultural geneticist named Rebo Rigatti at the San Michele all'Adige research center in Trentino. Rigatti lived from 1891 until 1971, which made him a contemporary of Luigi Manzoni, creator of many Italian crossings such as Manzoni Bianco. Manzoni was certainly a more prolific breeder and his crossings are definitely more widespread today than Rigatti's, as evidenced by the fact that Rebo, Rigatti's most well-known crossing, is planted on less than 100 acres in Italy today, as opposed to 24,000 acres for Manzoni Bianco. Many sources (such as Wine Grapes) indicate that Rigatti initially listed Rebo's parentage as Merlot x Marzemino, but that DNA evidence has recently shown that it is in fact a Merlot x Teroldego crossing. Lacombe et al. (citation 1), in their massive study which analyzed several thousand grape varieties to test for synonymies and parental relationships, confirmed that the correct parentage is Merlot x Teroldego, but they list it as confirmation of the breeder's data, which suggests that Rigatti had the parentage recorded correctly all along. I do not have access to Rigatti's papers or published reports so I'm not sure what he actually said, but I don't suppose it matters much since the actual parentage has been confirmed several times at this point.
Most of the Rebo grown in Italy is in the province of Trentino, where Rebo Rigatti lived and worked. Wine Grapes claims that varietal wines from Rebo are grown only in the Trentino DOC, but I think what they mean is that the Trentino DOC is the only DOC or DOCG area in Italy that allows for varietal Rebo wines. Today's wine, the 2009 Pratello "Nero per Sempre," is from the Benaco Bresciano IGT region, which is around the western shore of Lake Garda in Lombardy. Nero per Sempre means something like "black forever" in Italian, but I'm not exactly sure what that's supposed to mean in this context. This wine is made from 100% Rebo grapes that are dried in wooden boxes with forced ventilation for 30 days. The partially dried grapes are then pressed and the juice is poured into stainless steel tanks for fermentation. The process is very similar to the production of Amarone, but the drying time for Amarone grapes is much longer. Pratello also makes a regular table wine from non-dried grapes that is 95% Rebo and 5% Barbera, but I wasn't able to try that particular wine.
CITATIONS
1) Lacombe, T., Boursiquot, J.M., Laucou, V., Di Vecchi-Staraz, M., Peros, J.P., & This, P. 2012. Large scale parentage analysis in an extended set of grapevine cultivars (Vitis vinifera L.). Theoretical and Applied Genetics, 126(2), pp 401-414.
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