Abscission (from ab- away from, and scission cutting or severing) is the shedding of a body part. It most commonly refers to the process by which a plant intentionally drops one or more of its parts, such as a leaf, fruit, flower or seed, though the term is also used to describe the shedding of a claw by an animal. Divisions Land plants (embryophytes) Non-vascular plants (bryophytes) Marchantiophyta - liverworts Anthocerotophyta - hornworts Bryophyta - mosses Vascular plants (tracheophytes) Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongues Seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering plants Adiantum pedatum (a fern... In botany, a leaf is an above-ground plant organ specialized for photosynthesis. ... Fruit stall in Barcelona, Catalonia. ... Wildflowers Flower (Latin flos, floris; French fleur), a term popularly used for the bloom or blossom of a plant, is the reproductive structure of those plants classified as angiosperms (flowering plants; Division Magnoliophyta). ... SEED is a block cipher developed by the Korean Information Security Agency. ... A claw is a curved pointed growth found at the end of a toe or finger, or in arthropods, of the tarsus. ...
A plant will abscise a part either to discard a member that is no longer necessary, such as a leaf during autumn, or a flower following fertilisation; or for the purposes of reproduction. Autumn (often referred to as fall in North America) is one of the four temperate seasons, the transition from summer into winter. ... A spermatozoon fertilising an ovum Fertilisation (also known as conception, fecundation and syngamy) is fusion of gametes to form a new organism. ... For other uses, see Reproduction (disambiguation) Reproduction is the biological process by which new individual organisms are produced. ...
The gaseous plant hormone ethylene can stimulate abscission. R-phrases R12, R67 S-phrases S2, S9, S16, S33, S46 Flash point Flammable gas Explosive limits 2. ...
The abscission layer, a barrier of thin-walled parenchyma cells, develops across the stem (or petiole) at the base of a leaf, flower, or fruit as it approaches the time of falling from a plant.
Abscission is the process that should be recognized for creating the beautiful autumn colors of deciduous trees in temperate regions, and this specialized layer acts as the breaking point for separating the plant from its terminal appendages.
The abscission layer is comprised of minute tubules designed to transport water to the leaf, flower, or fruit and carry carbohydrates back into the tree.
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