The following video shows the nutational movements of morning glory vines (10 minute intervals). Climbing vines need to find a suitable support on which to grow. Shortly after germinating, the young plant begins what appears to be a hunting motion in which the shoot tip rotates in a nutational movement. This swinging around of the tip is thought to help the plant bump into a support. If the shoot rubs against a support with the right shape, the rubbing induces a thigmotropic response (tropism induced by touch) and the shoot begins to curl around the support.
Reference:
https://www.youtube.com/watch?v=dTljaIVseTc
http://sciencetrack.blogspot.sg/2007/07/twining-motion-of-vines.html
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