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enlarged tip of a rhizome (underground stem) that stores food. Although much modified in structure, the tuber contains all the usual stem parts—bark, wood, pith, nodes, and internodes. The eyes of a potato tuber are nodes where sprouts appear, and they are arranged in the same spiral pattern characteristic of buds on an aerial stem.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a modified shoot of a plant with a thickened stem consisting of one or several internodes (sometimes a thickened hypocotyl or part of the root). Tubers located above the ground are usually green and have leaves (such as kohlrabi and some tropical orchids). Underground tubers usually have the leaves reduced to very small scales that fall off early; the buds that form in their axils are called eyes. Tubers usually store nutrients, most often starch and other carbohydrates, and more rarely, oils (as in chufa).

Tubers develop from the parenchymatous cells of the phloem and xylem, and, less often, from the pith. They can appear on the main axis of the plant (usually at the base) as well as on lateral shoots (as in field horsetail and marsh woundwort) and on underground shoots, or runners (as in potatoes and Jerusalem artichoke). Tubers in the form of hypocotyls are found on cyclamen and certain Umbelliferae such as Chaerophyllum, tuberiferous caraway (Carum bulbosa), Corydalis, and Eranthis. Tubers usually serve for propagation. After the runners atrophy, the buds sprout and adventitious roots form, and the tuber develops into a new plant. In some plants aboveground tubers develop into inflorescences. In these cases, small tubers with thickened axes form in the axils of the bract. The buds of the tubers produce from two to four leaves, and, after falling off the plant, the buds take root, forming new plants (viviparous plants). In Ficaria the sprouting of the tubers that develop in the leaf axils and the formation of adventitious roots take place after the tubers fall off the plant, usually after wintering. Plants whose tubers are used as food for man, or feed for animals, or for industrial raw materials are called tuber crops.


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


The enlarged end of a rhizome in which food accumulates, as in the potato.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. a fleshy underground stem (as in the potato) or root (as in the dahlia) that is an organ of vegetative reproduction and food storage
2. Anatomy a raised area; swelling
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Also, brown rot in the vascular ring is visible if the tuber is sliced in half, which renders the crop unfit for human consumption.There is no effective chemical treatment for the disease.
According to Fu's students, they have found five new truffle species since 2014, including Hydnotrya formosanum and Tuber piceanum.
When you harvest your sweet potato crop, you should save at least one tuber for every 10 slips you want for the following season.
Tubers yield and its components: At harvesting stage the following characters were determined for each experimental block; weight of tubers (g/plant), number of tubers/plant, average weight of tuber (g/tuber), average weight of tubers (tons/ha), marketable tubers yield (good shapes and healthy tubers) and unmarketable tubers yield (off shape, blemished, green and diseased tubers).
Potato, tapioca, yams and sweet potato are the common tuber crops that can be consumed as staple food by any one instead of rice and wheat or any other cereals and millets.
The tuber specific gravity, dry matter and starch contents are critical in determining the quantity and quality of both products of industries (starch) and processed foods (French fries and chips) [10, 11].
A good response of potatoes to the fertilizer application is considered when it resulted in improved weight of tuber and increased yield.
Nighttime temperatures below 17[degrees]C and daytime temperatures between 23 and 25[degrees]C are the most favorable for tuber production (HELDWEIN et al., 2009), whereas high temperatures stimulate the growth of the shoot, to detriment of tubers (BEUKEMA & VAN DER ZAAG, 1990).
This is due to high production of potato if grown in environments with low temperatures about 17-20[degrees]C [5, 6] and the optimum temperature of tuber formation is 18[degrees]C [7,8].
Tuber size of TPS genotypes differed significantly, the results showing greater numbers of micro (179.5), small (37.7), medium (20.4) and large (7.4) tubers in TPS-9804.
Currently the most important feature of potato production is tuber's processing quality especially for chips processing this are because consumers are now much more concerned about quality, so it is the grower's responsibility to take into account this fact.
Disease severity was assessed on a visual disease rating scale 0-5 based on per cent tuber surface showing disease showing disease symptom as described by Ahmad et.