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Movement of sessile organisms in response to contact, especially in plants.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



thigmotropism, the ability of plant organs to change their direction to avoid irritations from one side (such as touching or friction). Haptotropism is characteristic of the tendrils of vines, such as beans and squashes. The growing tendrils possess very high sensitivity to irritation, which is sensed by special epidermal cells. Haptotropism is also observed in the trunks, roots, and leaf stalks of some plant types.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.