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Cross-fertilisation

Term for the transfer of pollen grains from one flower to the stigma of a second flower on another plant (cross-pollination), which causes cross-fertilisation (xenogamy). In the case of grapevines, this can be a neighbouring vine of the same variety, but also a vine of any other variety from a neighbouring vineyard (see flowering). In contrast to this is self-fertilisation within a hermaphrodite flower (autogamy) or between two different flowers of the same plant (neighbour fertilisation = geitonogamy). Most cultivated grapevines are self-fertilised ( self-pollination ) within the hermaphrodite flower. In the case of purely female grape varieties, cross-fertilisation must be forced by hermaphroditic varieties planted nearby or in a mixed set. In the case of new varieties, cross-fertilisation with the desired or selected partner takes place in a targeted or deliberate manner, so to speak.

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