Term (virginity) for the unisexual reproduction or fruit development without previous fertilization in plants, which takes place without the formation of seeds or seeds. The phenomenon also occurs in animals such as the phylloxera before and is called parthenogenesis (virgin generation). Certain hormones are used to show the fertilized egg cell a fertilization situation, whereupon it begins to divide and matures into an organism. In plants, a distinction is made between inductive, spontaneous vegetative and sham parthenocarpy (stenospermocarpy) triggered by external stimuli. The inclination is determined by favorable environmental conditions such as temperature and humidity promoted.
Inductive parthenocarpy is caused by mechanical stimulation of the carpel blossom triggered. It can also result from flowers frosts arise when the ovule is destroyed, but the ovary tissue remains intact. Parthenocarpy is common in pineapples, apples, bananas, pears, figs and citrus fruits. Parthenocarp fruits typically have no or only rudimentary seeds (at grapes the cores). Virginity can also be artificially treated by treating the flowers auxins (Hormones) are produced, in this way seedless (low-seed) eggplants, cucumbers and tomatoes are grown.
completely seedless Grapes are a coincidence, or a whim of nature. Almost all traditionally grown seedless grape varieties, like that at table grapes is desired, but are not entirely without cores. In addition to some parthenocarpic (seedless) berries, there is a high proportion of berries with stunted, very soft kernels, which you therefore do not feel when eating. The name is then stenospermocarpy. In common parlance, no distinction is made between parthenocarpic and stenospermocarpic ovules and all are referred to as "seedless", although "poor in core" would be more correct.
Corelessness is not a static state. If that were the case, you would not be able to grow new seedless / low-seeded grape varieties, because the seeds for the germination of the seedling are an unconditional requirement (see also under blossom ). The Verrieseln is often referred to as parthenocarpy. But this is wrong because with the grapevine no real virginity has yet been demonstrated.