Guttation


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Related to Guttation: Hydathodes

guttation

[‚gə′tā·shən]
(botany)
The discharge of water from a plant surface, especially from a hydathode.

Guttation

 

the exudation of water droplets by plant leaves, occurring when more water is absorbed by the roots than is evaporated by the leaves. It is observed mainly at night, in the early morning, or when plants are placed in a humid atmosphere; it is often observed in young sprouts, such as those of grains, whose root-system development overtakes the development of the evaporative surfaces of their leaves. The drops of water are secreted through water stomata under the action of root pressure, by the force of water pressing into the stems and leaves. Guttation is a physiological process connected with the life processes of the plant; if wheat sprouts are placed under a cone inside of which there is chloroform vapor, guttation ceases. Secretions of guttation always contain a number of mineral substances. Evidently guttation rids the plant of excess salts, mainly calcium.

References in periodicals archive ?
Composition of guttation fluid from rye, wheat and barley seedlings.
nectar, pollen, guttation fluid, and soil, and found numerous data gaps that do not support the safety of these chemicals.
In some extant angiosperms, guttation occurs primarily in the young leaves, whereas older leaves do not consistently express guttation (e.
For example, many studies show that teeth are strongly associated with the movement of water out of leaves via transpiration and guttation.