abscission


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Related to abscission: abscission layer, abscission zone

ab·scis·sion

(ab-si'shŭn), Avoid the mispronunciation ab-si'zhŭn.
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]

abscission

/ab·scis·sion/ (-sĭ´zhun) removal by cutting.

abscission

(ăb-sĭzh′ən)
n.
The act of cutting off.

abscission

[absish′ən]
Etymology: L, abscinere, to cut away
the process of cutting away, as in corneal abscission, removal of the prominence of the cornea.

abscission

An antiquated term for cutting; in modern medicine it has been replaced by the term excision, see there.

ab·scis·sion

(ab-sish'ŭn)
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]

abscission

The act of cutting off.
Abscissionclick for a larger image
Fig. 4 Abscission . Abscission layer in a leafstalk.

abscission

the process by which plant organs are shed. This process occurs in the stalks of unfertilized flowers, in ripe fruits and in the base of the petiole of deciduous leaves in autumn, or in diseased leaves at any time. It is due to the formation of an abscission layer of thin-walled cells in the stalk base which rupture under strain produced by e.g. wind. A layer of cork forms beneath the abscission layer to seal the plant surface. Abscission is controlled by plant hormones present: a low concentration of AUXIN, high amounts of ETHYLENE, and (in some plants) a high concentration of ABSCISIC ACID all stimulate production of the abscission layer.

ab·scis·sion

(ab-sĭ'zhŭn)
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]

abscission

removal of a part or growth by cutting.
References in periodicals archive ?
High night temperatures (above [+ or -] 17 [degrees]C) can cause flower abscission in some cultivars during flowering.
These have been thought to be abscission scars of flowers (Rhode 1820), roots (Carruthers 1879), bulbils (Stur 1875), cones (Lindley and Hutton 1833; Thomson 1880) and branches (Watson 1908; Renier 1910; Lindsey 1915; Jonker 1976).
Lessons from water ferns: involvement of reactive nitrogen species in root abscission response of plants.
Reactions include flowering, dormancy, and leaf abscission.
If for some reason, including seasonal triggers, the level of auxin in the leaf falls, there is a good chance that an abscission layer will form at the base of the petiole.
Interactions between the four compartments are simulated by six functions which calculate the flow of biomass: one growth function, one reproductive function, two senescence functions, and two functions simulating abscission of dead tissues and their disappearance in the litter.
Ethylene stimulates flower and fruit abscission (separation from plant) and flower opening.
Antlers are shed when a thin layer of tissue called the abscission layer disconnects the antler from the pedicle.
Topics include a review of cell separation and adhesion processes in plants; cell wall structure, biosynthesis and assembly; vascular cell differentiation; cell adhesion, separation and guidance in compatible plant reproduction, cell separation in roots, organ abscission, dehiscence, fruit ripening and the role of polymer cross-linking in intercellular adhesion.