Where does guttation take place in plants

Guttation (water excretion)

Definition: what is guttation?
Guttation is the separation of water droplets caused by root pressure in some plants.

What is the difference to plant perspiration?
In contrast to transpiration, in which water is released in the form of water vapor, guttation is the release of liquid water.

Where on the plant is the water released?
The water is usually released through so-called hydathodes, in some cases also through stomata (stomata).

When and under what conditions does guttation occur?
The guttation occurs mainly at high humidity, i. That is, when the plant cannot give off any water, or only to a limited extent, through transpiration (as a result of the water vapor saturation of the atmosphere). The guttation thus serves to maintain the flow of water through the plant and to supply the aboveground area of ​​the plant with nutrients from the roots. (If the air humidity is high, the transpiration comes to a standstill and with it the transport of substances from the root to the shoot and into the leaf!).
Guttation typically occurs on warm days after heavy rainfall. Many plant species in the tropical rainforest are dependent on guttation (due to the high humidity or water vapor saturation of the air).

In which plants does guttation occur?
The guttation occurs z. B. in the nasturtium (Tropaeolum majus) or the lady's mantle (Alchemilla vulgaris).

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Last update: 01/09/2013

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