a growth-regulating plant hormone, C 15 H 20 O 4 , that promotes dormancy and the aging and abscission of leaves.
A plant hormone that maintains the water balance of plants, prevents seed embryos from germinating, and induces the dormancy of buds and seeds. Chemical formula: C15H20O4.
(in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis. Historical Examples Ordinate represents geo-electric excitation; abscissa, distance from upper surface of flower stalk. Life Movements in Plants, Volume II, 1919 Sir Jagadis Chunder Bose The abscissa of such a curve is the reading of the […]
(in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis. noun (pl) -scissas, -scissae (-ˈsɪsiː) the horizontal or x-coordinate of a point in a two-dimensional system of Cartesian coordinates. It is the distance from the y-axis measured parallel to the x-axis Compare ordinate n. 1690s, from […]
the act of cutting off; sudden termination. Botany. the normal separation of flowers, fruit, and leaves from plants. noun the separation of leaves, branches, flowers, and bark from plants by the formation of an abscission layer the act of cutting off n. “removal or cutting away,” early 15c., from Latin abscissionem (nominative abscissio) “a cutting […]
- Abscission layer
the layer of specialized, cutinized parenchyma cells that develops in the abscission zone, the disintegration of which causes abscission. noun a layer of parenchyma cells that is formed at the bases of fruits, flowers, and leaves before abscission. As the parenchyma disintegrates, the organ becomes separated from the plant
- Abscission zone
the zone at the base of a leaf petiole, fruit stalk, or branch in which the abscission layer develops.