Impact of clonal variability in Vitis vinifera Cabernet franc on grape composition, wine quality, leafblade stilbene content and downy mildew resistance.
Journal of agricultural and food chemistry | 5 Dec 2012
C van Leeuwen, JP Roby, V Alonso-Villaverde and K Gindro
Abstract: In this study, ten clones of Vitis vinifera Cabernet franc (not yet commercial) have been phenotyped on precocity, grape composition and assessment of wine quality made by micro vinification in 2008, 2009 and 2010. Additionally, two original criteria have been considered: concentration of 3-isobutyl-2-methoxypyrazine in grapes and wines (the green bell pepper flavor) and resistance of grapevines to downy mildew (Plasmopara viticola) by stilbene quantification upon infection. Precocity of veraison varied up to four days at veraison. Berry size and yield were highly variable among clones. However, these variables were not correlated. Tanins and anthocyanins varied among clones in grapes and wines. Variations in grape and wine IBMP were not significant. Some clones showed lower susceptibility for downy mildew on leaves. Lower susceptibility was linked to a higher production of stilbenic phytoalexins involved in downy mildew resistance mechanisms.
* Data courtesy of Altmetric.com