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a kind of underground perverted stem. The end of the underground stem forms a puffy and irregular block shape, which is suitable for storing nutrients and wintering perverted stems. The top is fat, has developed thin
tissue
, store rich nutrients. The surface of the tubers has many bud eyes, generally arranged in a spiral shape, buds have 2
to
3
buds, only one of the buds is easy to germinate, can grow new branches, so the tubers for reproduction. The top of the tuber has a top bud, such as the potato tuber is more typical. The underground branches of the potato grow in the soil layer, and when elonged
9
to
12
cm, the ends are puffy, forming fat tubers with short sections. On the long-forming tubers, the surface has perideron skin and a few skin holes. The cortical layer, the outer ligament, the woody part, the inner ligament and the central myelin can also be divided on the cross-cutting surface of the tuber. In terms of shape or structure, it can be said that it is a pervert of the stem. Chrysanthemum taro, half-summer, ganry (grass and stone silkworms) and so on have tubers.
