abscission layer


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Related to abscission layer: abscission zone

abscission layer

[ab′sizh·ən ‚lā·ər]
(botany)
A zone of cells whose breakdown causes separation of a leaf or other structure from the stem.
References in periodicals archive ?
At a basic level, three major developmental shifts must occur to establish a normal, functional gemma: 1) a shoot meristem must be formed in a position that would normally bear a leaf, 2) the extension of the shoot must be slowed and then arrested at an early stage of development and 3) an abscission layer must form to allow the gemma to be dispersed.
As the cells in the abscission layer become drier and more cork-like, it creates a barrier to the transport of minerals and other substances into the leaf.
Instead of deadheading roses by cutting back to the first five-leaflet leaf as standard practice dictates, England's Royal Horticultural Society has found that snapping off the bloom at the abscission layer (where the stem is swollen just beneath the flower) actually produces more new flowering shoots than the old method.
Using a scanning electron microscope, Tucker and colleagues examined the area of cells on the abscission layer, where stem and leaf perform the delicate biochemical surgery.
The construction of a wall called the abscission layer, where the leaf stem (petiole) joins the twig, first inhibits and finally cuts off the flow of sugars from the leaf to the remainder of the plant.