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Genetically heterogeneous group of a crop species, which consists of several morphological and physiological differing from each other game types composed. They are by long-lasting, natural selection in a mostly narrowly defined area autochthonous emerged and therefore adapted to the ecological conditions in this very well. That means they are high resistance against for example drought (Dryness), frost, Diseases and pests can have. In addition, they are relatively secure in yield, as they respond very flexibly to location fluctuations, such as weather, due to the large spread of their genetic characteristics. In contrast to high-performance varieties, they are usually less productive. In viticulture these come mostly very old ones varieties isolated in vineyards or as house vines. In the Rebtucht-Anstalten one is very concerned about their preservation, as with new varieties desired genes can be crossed. Therefore, they are kept in herbaria and also conserved in gene banks. See also the topic under Old plants as well as a complete list of varietal relevant keywords under grapevine,

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