Exudation

Exudation [ Botany - Phytopathology ] Exudates	Dictionary of botanic terminology - index of names

An exudates is a substance (usually liquid) that oozes out from plant.

The exudation is the process of exuding; the slow escape of liquids out of a plant through pores, diseased or injured tissue, including gum, sap, resin, and latex. The exudate pass from within a plant structure to the outer surface or into the surrounding medium; as in leaf exudate, root exudate, etc.
The presence of an exudate often aids in diagnosis (eg, fire blight bacteria).

To exude [ Botany ]


	*Slowly discharge; leak liquid material through pores or cuts.*

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994