callus


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callus:

see corns and callusescorns and calluses,
thickenings of the outer layer of skin where there is irritation or constant pressure. Corns are cone-shaped with their points protruding into the dermis, or inner layer of skin. They usually have hard, shiny surfaces surrounded by red, painful areas.
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Callus

 

(1) Tissue formed in plants on the surface of a wound (cracks, taps, the bases of cuttings, and areas of concrescence of stock and scion). A callus promotes the healing of wounds. Consisting of thin-walled parenchymal cells, a callus develops when there is cell division of any living tissue of the plant (cambium or phloem) in the peripheral zone of the pith, lying next to the protoxylem. Adventitious roots and buds, particularly with grafting, often develop in the callus. (2) Corpus callosum, an accumulation of callóse that obstructs the sieve plate when the sieve tubes of the phloem age. Use of the term in this sense is obsolete.


Callus

 

a thickening of the horny layer of skin as a result of constant pressure or friction. Calluses usually appear on the palms, soles, and other parts of the body that are in constant contact with tough surfaces. The cracks formed on the surface of a callus may hinder one’s ability to work, and they can also be portals of entry for pyogenic microbes, resulting in such conditions as erysipelatous inflammations and phlegmons.

callus

[′kal·əs]
(botany)
A thickened callose deposit on sieve plates.
A hard tissue that forms over a damaged plant surface.
(medicine)
Hard, thick area on the surface of the skin.

callus

1. an area of skin that is hard or thick, esp on the palm of the hand or sole of the foot, as from continual friction or pressure
2. an area of bony tissue formed during the healing of a fractured bone
3. Botany
a. a mass of hard protective tissue produced in woody plants at the site of an injury
b. an accumulation of callose in the sieve tubes
4. Biotechnology a mass of undifferentiated cells produced as the first stage in tissue culture
References in periodicals archive ?
Embryonic callus induction medium III: Lindeman Orchid Medium and minerals, 400 mg/l casein, 1 g/l activated charcoal, 2.5 mg/l 2,4-D and 2 g/l gelrite.
The best means for callus formation in Dipteryx odorata were obtained in treatments containing 8.0 mg.[L.sup.-1] of TDZ in MS medium;
Data regarding number of induced callus, the number of embryogenic callus, plantlet regeneration, shoot elongation, and root induction were subjected to analysis of variance according to Steel et al.
In comparison with the other maize genotypes the BR451 regeneration profile reported in this study was satisfactory (three adult plants/ gram of callus).
As the objective of this work was producing pigments in callus culture, we evaluated three main aspects in the cultivation (percentage of callus formation, color and callus appearance) to select the best culture media for experimental sequence as shown in Table 1.
The first report of cotton somatic embryogenesis demonstrated the regeneration of cotton plantlets from somatic embryos of Coker variety 310 using 2 years old callus [8].
Along with other secondary metabolites AY-phellandrene was the most prominent secondary metabolites found in in vitro grown callus cultures of both the varieties.
We evaluated the percentage of rooting and callus from the count of total rooted and calloused layers in each period, respectively.