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April 2017 WINES&VINES 41 PRACTICAL WINERY & VINEYARD BARRELS Current research deals with analysis of newly identified QTT and Glu-BA in wood coming from both species. Forty-six samples of fresh oak material were collected from eight French forests: three in northeast (Saint-Clément, Spincourt and Xures), two in center (Tronçais and Chateau- roux), one in northwest (Liffré), one in southwest (Pierroton) and one in southeast (Lavey- ron). Samples from Pierroton and Laveyron were provided by the French National Institute for Agricultural Research and Dr. E r w a n G u i c h o u x . T h e o t h e r samples were supplied by Se- guin-Moreau cooperage. The distribution of the samples is provided in "French Oak Sourc- ing Origins" below. Each sample represented oak shavings from one single living oak tree drilled at a height of 1 meter. The shavings were col- lected in a plastic bag filled with silica gel beans. Green leaves from the same tree were col- lected in a separate plastic bag filled in the same way with silica gel beans. Both samples from one tree were identified with the same code and sent to the labo- ratory. A genetic analysis was run on leaves immediately after sample reception. Genetic assignment of species The genetic assignment method was used in this study for the oak samples. It consists of assigning individual trees to species (Quer- cus robur or Quercus petraea) based on the expected frequen- cies of their genotypes, as de- scribed by E. Guichoux et al. 23,24 The percentage of assignment shows the probability of a tested individual tree to belong to one species rather than another. The statistical threshold is 87.5%, which allows assigning individ- ual trees to a single species. The individuals being assigned with probability higher than 87.5% to one specific species are either Q. robur (pedunculate oak) or Q. petraea (sessile oak), while indi- viduals assigned with probability lower than 87.5% should be con- sidered hybrids (hybrid F1, F2, backcross of first generation). C h e m i c a l a n a l y s i s : O a k w o o d s h a v i n g s w e r e d r i e d , ground into a homogeneous pow- FRENCH OAK SOURCING ORIGINS Forty-six samples of fresh oak material were collected from eight French forests identified on the map above. Liffré Chateauroux Pierroton Spincourt St. Clément Xures Tronçais Laveyron Oenosylva offers a range of œnologic oak products sourced from the most prestigious forests in France. All of the products are manufactured from stave-quality oak that has been naturally seasoned in the open air. Oenosylva products are finely calibrated to provide the perfect organoleptic contribution of oak during the winemaking process. A range of proprietary techniques and three consistent toasting methods give the wine a subtle range of aromas. Contacts: Caroline Hoogenboom Napa - Sonoma - East Coast Cell: (707) 364-6334 caroline@oenosylva.com Amy Lee Oregon - Washington California Central Coast Cell: (509) 995-2771 amy@oenosylva.com Office: 1285 S. Foothill Blvd Cloverdale, CA 95425 Ph: (707) 224-2377 Fax: (707) 224-2390 www.oenosylva.com