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Orientation involving growth or movement of a sessile organism or part, especially plant roots, in response to the presence of water.
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 It might be outdated or ideologically biased.



the tendency of the growing organs of plants, particularly the roots, to grow away from a less moist environment toward a moister one. Where there is an uneven distribution of moisture in the soil, plant roots are directed to the moister areas because of hydrotropism. Hydrotropic sensitivity is concentrated in the very tip of the root. Sometimes negative hydrotropism is observed. For example the sporangiophores of many molds grow away from a moist substratum.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Likewise, we observe a withered plant watered by rain and its resultant rejuvenation as roots orient themselves to new sources of water, e.g., hydrotropism. These examples suggest that the first khanda, rupa or form which is the body-cum-sense-or gan, may be at work in plants.
Hydrotropism and its interaction with gravitropism in maize roots.