Thermotropism


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Thermotropism

 

in plants, the bending of growing parts, such as the stems or root tips, in response to a heat stimulus. Thermotropism may be observed by placing rootlets in moist sawdust between two vessels—one filled with cold water and one with warm water. Up to a certain temperature the rootlets bend in the direction of the warmer vessel (positive thermotropism); above that temperature they bend toward the cooler vessel (negative thermotropism).

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