abscission
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Related to abscissions: abscission layer
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An antiquated term for cutting; in modern medicine it has been replaced by the term excision, see there.ab·scis·sion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.)
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.