abscission


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
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

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

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An antiquated term for cutting; in modern medicine it has been replaced by the term excision, see there.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]
References in periodicals archive ?
S.,1-MCP blocks ethylene -induced petal abscission of pelargonium peltatum but the effect is transient.
According to the results, the evaluated variables: abscission, berry resistance to abscission, rachis browning index, epidermis color (L*, a*, b*), and tartaric acid showed no significant difference between fruits harvested and stored at 0 [degrees]C with 90% RH and fruits exposed to a temperature of 35 [degrees]C and RH of 40% for 8 h prior to cold storage.
The highest NaCl concentration reduced leaf area, and this result was due solely to leaf abscission, which was one of the most affected parameters.
Ethylene stimulates softening of fruits and the formation of an abscission layer in the stem.
Herbivory increased the amount of leaf abscission with a greater than 4-fold difference in biomass shed between restricted and unrestricted herbivory treatments (Fig.
The abscission layer in Cannabis glandular trichomes is best observed in sifted hashish preparations in which gland heads and gland stalks appear as separate entities with the head cells broken away cleanly at the abscission layer.
Lenhart, Stephen DiNardo, "Somatic Cell Encystment Promotes Abscission in Germline Stem Cells following a Regulated Block in Cytokinesis," Developmental Cell, 2015; DOI: 10.1016/j.devcel.2015.05.003
The seasonal trend from July to September is characterized by increasing temperature, low or no rainfall rates, low soil water content and relative air humidity with increasing vapor pressure deficit, increasing leaf abscission of older leaves and the production of reproductive structures of V.
Field-grown Pinot Gris vines were sprayed with 400 mg/L ABA at different stages of development (veraison, post-veraison, components or fruit composition, but it caused early leaf abscission, advanced bud dormancy and eventually increased freezing tolerance.
A decrease in transpiration leads to leaf wilting and early senescence; finally resulting in foliar abscission (Ashraf, 2012; Kozlowski and Pallardy, 1997).
Fruit set was evaluated 5-6 days after pollination when the difference in ovary swelling or abscission was obvious (Tepedino, 1981; Vidal et al., 2010).