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 Use of the term in this sense is obsolete.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 ?
The high auxin and low cytokinin ratio proved their importance for callusing from various explants, further increase in the concentration of hormone did not show any significant improvement in callusing [12].
The data on the number of explants callusing and the number of calli showing shoot buds (Cases i and ii) were analyzed as a 4 by 3 by 4 factorial design using a logistic regression model, where the response variable is presence or absence of some outcome event, and therefore considered binary.
All the experiment treatments were replicated at least 10 times, and data for callusing percentage and degree of callusing were recorded after 8 weeks of culture.
Genomic DNA was extracted from independently obtained kanamycin resistant callusing and subjected to PCR with oligonucleotide specific primers for NIC gene.
Callusing ability of MS + BN3,2 (3 mg/L BAP + 2 mg/L NAA) supplemented medium was maximum i.
The present study describes the effect of plant growth regulators for inducing direct somatic embryogenesis and callusing induction from cotyledonary node (CN) explant of peanut.
demonstrated callusing after 18-22 days following inoculation.