| Title: | Evolution over the growing season of volatile organic compounds in Viognier (Vitis vinifera L.) grapes under three irrigation regimes |
| Author(s): | Wang J; Abbey T; Kozak B; Madilao LL; Tindjau R; Del Nin J; Castellarin SD; |
| Address: | "Wine Research Centre, University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada. Wine Research Centre, University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; Department of Genetics, Plant Breeding and Seed Production, Wroclaw University of Environmental and Life Sciences, Plac Grunwaldzki 24A, Wroclaw 50-363, Poland. Road 13 Vineyards, 799 Ponderosa Rd, Oliver, BC V0H 1T1, Canada. Wine Research Centre, University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada. Electronic address: simone.castellarin@ubc.ca" |
| DOI: | 10.1016/j.foodres.2019.108512 |
| ISSN/ISBN: | 1873-7145 (Electronic) 0963-9969 (Linking) |
| Abstract: | "Recent studies revealed that terpenes present in grapes determine the 'stone fruit' aroma of Viognier wines. This study analysed the evolution of free and glycosylated terpenes along with other volatile organic compounds (VOCs) during berry development in Viognier berries exposed to three irrigation regimes. These regimes (standard irrigation over the season, early deficit irrigation from 25?ª+days after anthesis to veraison, prolonged deficit irrigation from 25?ª+days after anthesis to harvest) were imposed to Viognier grapevines grown in the Okanagan Valley (British Columbia, Canada). Berry samples were collected over the season and analysed for determining the chemical composition, including free and glycosylated VOCs, and the expression of genes related to VOC biosynthesis. Among free VOCs, aldehydes peaked at veraison, alcohols did not vary across berry development, and terpenes increased during ripening. Among glycosylated VOCs, aldehydes and terpenes mirrored the free fractions while alcohols peaked before veraison. At harvest, a larger concentration of linalool oxides was detected in the glycosylated than in the free fraction. Increases of terpenes during ripening were modulated at the transcriptional level, particularly by two terpene synthases VviCSbOci and VviPNLinNer1. Early deficit irrigation increased the concentration of free alpha-terpineol and linalool, while prolonged deficit irrigation reduced the concentration of glycosylated alpha-terpineol. These results provide a basis for further studies on managing Viognier grape aroma in vineyards" |
| Keywords: | Agricultural Irrigation/*methods Aldehydes/chemistry/metabolism Fruit/chemistry/metabolism Odorants/analysis Terpenes/chemistry/metabolism *Vitis/chemistry/metabolism *Volatile Organic Compounds/analysis/metabolism Aromatics Berry ripening Terpene synthas; |
| Notes: | "MedlineWang, Junfang Abbey, Tyler Kozak, Bartosz Madilao, Lufiani Lina Tindjau, Ricco Del Nin, Jeff Castellarin, Simone Diego eng Research Support, Non-U.S. Gov't Canada 2019/09/27 Food Res Int. 2019 Nov; 125:108512. doi: 10.1016/j.foodres.2019.108512. Epub 2019 Jun 24" |
