Crossing direction

When crossing grape varieties, the parentage is indicated in the form of "New variety = mother variety x father variety". For example, "Müller-Thurgau = Riesling x Madeleine Royale". This is referred to as the direction of crossing. It is important for the determination that essential cell components with their own DNA are passed on from the mother to the embryos in the seed. These are the cell nucleus, the two plastids chloroplast and amyloplast as well as the mitochondrion. In contrast, only the cell nucleus is transferred from the father.

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