Usually own Wine grapes four to five (rarely six) cores. Coreless or low-kernel berries are an important quality criterion table grapes That's why varieties are bred with this property. Entirely seedless berries are a whim of nature due to various environmental conditions. The phenomenon occurs mainly as a consequence of parthenocarpy (Virginity), that is, fruit development without prior fertilization. Strictly speaking, these grapes have not only seedless, but low-kernel berries. These are also not perceived because of their softness when eating. The number, size and condition of the hereditary plants, as well as the temperature during the growth depends.
In commercial grape cultivation, quality-enhancing effects are next to optimal climate additionally by special fertilizer, irrigation and growth-regulating measures. Become for larger berries gibberellins (Hormones) used. Without these measures, the grapes show defects such as bad ones blossom, small berries, late grape ripeness, a neutral bland taste, poor wood maturity, weak fungal tolerance and mushy berry meat on. Since increased use of fertilizer from the middle of the 20th century, the proportion of berries with kernels increased, which was further enhanced by the use of gibberellins.