tuber


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tuber,

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.

Tuber

 

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.

L. V. KUDRIASHOV

tuber

[′tü·bər]
(botany)
The enlarged end of a rhizome in which food accumulates, as in the potato.

tuber

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
References in periodicals archive ?
They have shown that against all conventional thinking, tuber crops and wheat can be substitutes to their traditional habit of rice consumption.
Therefore, this research was conducted with the following objectives: i) to evaluate potato cultivars for internal quality of tubers and identify wide adaptable varieties, ii) to determine the effects of genotype, environment, genotype x environment interaction and stability of tuber internal quality traits, and iii) to estimate the coheritability and correlation of tuber internal quality traits.
2006), since it directly influences the yield potential of the tuber seed (STRUIK, 2007).
a) the average ascospore volume in tetrasporic asci: 15,000 um3 instead of 10,000 um3 and 5,000 um3, the last two measured in the single last two Tuber species, respectively; b) the ascospores shape and ornamentation: spherical (22.
To enhance potato accessibility throughout the year and to increase the tuber preservation with low/no weight loss and deterioration, proper storage along with controlled temperature conditions are essentially required.
The organic amendments (Vermicompost, Farm Yard Manure and Neem cake) were applied as soil treatment and the chemicals (Bavistin and Boric acid) and biocontrol agent (Trichoderma harzianum and Pseudomonas fluorescence) were used as tuber treatment.
8--Dry matter percentage was determined in 100 grams of a random tuber by drying the tuber slices at 70[degrees]C for 72 hours according to the method of Dogras et al.
In both studies, 11-day drought cycles were applied before tuber formation and again 10 days after tuber formation began.
Funded under DA-High Value Crops Development Program (DA-HVCDP) through the Bureau of Agricultural Research (BAR), the project aims to increase yam production in the country through mass production of viable plantlets using tissue culture techniques and to address seasonality by improving techniques in breaking tuber dormancy.
In both studies, 11-day drought cycles were applied before tuber formation began and around 10 days after tuber formation began.
The specific gravity and tuber dry matter percentage were taken with the help of Hydrometer.