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Tuber
plant's underground storage organ formed by the swelling of an underground stem which produces buds and stores photosynthate metabolites/nutrients, forming a seasonal perennating organ, e.g. a potato / From Wikipedia, the free encyclopedia
A tuber is the thickened part of an underground stem of a plant, such as the potato, with buds from which new plant shoots (stems and young leaves of a new plant) grow.[1]
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Most tubers are formed in the ground, but sometimes they can be formed above the ground, in the aerial stems; that is the case of the air potato (Dioscorea bulbifera).