Term (also direct bearer, self bearer, rootstock) for a vine when the lower part (rootstock) and upper part (scion) originate from the same plant. This means that no grafting has taken place. Worldwide, 90% of the vines used are grafted vines, as only these are guaranteed to be resistant to phylloxera.

Lower part (root system): 1 = grafting point, 2 = lateral roots, 3 = root stem, 4 = foot roots
Upper part (scion): 1 = one-year-old wood, 2 = biennial wood, 3 = cordon of old wood, 4 = trunk of old wood, 5 = watershoots of one-year-old wood, 6 = grafting site
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Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden