The process by which plants expel water from uninjured leaves in excess of transpiration. Exudation of water from plants, particularly along the leaf margin.
exudation of watery, sticky liquid from hydathodes, especially along leaf margins
n. (L. gutta, drop) formation of drops of water on plants from moisture in air; the process of water being exuded from hydathodes at the enlarged terminations of veins around the margins of the leaves.
The extrusion of liquid water through openings in leaves, caused by root pressure.
The phenomenon of plants exuding water as a liquid, seen especially in trees of hot, wet forests. See Collinson (1988).
plants having high root pressure under high relative humidity conditions will exude water at their leaf margins through specialized cells
Water droplets formed by exudation from the leaf, particularly under conditions of relatively high humidity.
The water exuded from leaves as a result of root pressure. Sometimes guttation is confused with dew, although the origin and appearance of the resulting drops are different. On grass, dew appears as many drops that cover the surface of the blade; dew forms by condensation from water vapor in the atmosphere. Guttation appears as a single large pendant drop at the tip of the blade; guttation forms by the extrusion of liquid water from the moist ground. Sometimes one is seen, sometimes the other, sometimes both. When a wet heiligenschein is seen on the grass it is mainly caused by dewdrops; when a rainbow is seen on the grass it is mainly caused by guttation drops. See also dewbow.
Guttation is the appearance of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses.
