The red grape variety (also GM 6494-5) is a new breeding between Zarya Severa x St. Laurent. Synonyms are Ambros Rot, Geisenheim 6494-5 and GM 6494-5, and genes of Vitis amurensis and Vitis vinifera are included. Although it is clearly a hybrid from a botanical point of view, it is not considered as such. Strictly speaking, these are prohibited within the EU for quality wines and local wines. In 2003, a study was carried out on behalf of the European Commission to establish criteria for the assessment of...
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.
Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)