Contractile Root

Adventitious or lateral roots with a pronounced capacity for longitudinal contraction, resulting in shoots being drawn into the soil.
Adventitious or lateral roots with a pronounced capacity for longitudinal contraction, resulting in shoots being drawn into the soil.

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This modification of roots, as the pull roots, typical of many bows, wooded area, saffron (Crocus), many orchids, water plants, etc

Сontractile roots due to the special structure able to be shortened by 10-70%, and drag the bulbs, corms, rhizomes, etc under the ground, which prevents plants from freezing in the winter.

Externally contractile roots are thick, with transverse striations.
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In angiosperm often contractile roots that provide a snug fit to the ground sockets (dandelion, plantain, etc.).

Thanks to an underground position of the root collar and the vertical rhizome, provided a deepening of the tubers in the soil. Ie contractile roots allow the shoots to choose the most favorable depth in the soil.

In adverse climatic conditions, for example in the Arctic, involving the roots to help survive the difficult winter flower-bud and buds resume.