Botany lecture notes

Hydathode or Water Stomata–Structure and Functions (Short Notes)


water stomata notes

Hydathode – Water Stomata
(Structure and Functions of Hydathodes)

What are Hydathodes?

Hydathodes are specialized pores (openings) particularly present on the leaf margins, which exudes or secretes drops of water. The exudation of water as drops from the tip or margin of the leaves is called guttation. The process of guttation is facilitated by the hydathodes.

Ø  They are also called as Water Stomata because they structurally resemble stomata and they facilitate guttation (secretion of droplets of water from the pores of plants).

Ø  Hydathodes are commonly found in Angiosperms, especially in grasses.

Ø  They are also present in some other plants such as water hyacinth, balsam, roses, Hibiscus and rarely in some non-angiospermic plants.

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Botany lecture notes

Difference between Stomata and Hydathodes (A Comparison Table)


Stomata vs Hydathodes Comparison

Stomata vs Hydathodes (A Comparison Table)
(Similarities and Differences between Stomata and Hydathodes)

Stomata and Hydathodes are specialized pores present in the aerial parts of plants associated with the release of water from the plant body to the surrounding environment.

Stomata: They are specialized pores present on the surface aerial plant parts especially on the lower epidermis of leaf, which facilitate Gaseous exchange and Transpiration. The stomatal pores are guarded by a pair of specialized epidermal cells called the Guard Cells. The guard cells can regulate the opening and closing of the stomatal pore and thereby regulate the gaseous exchange through the stomata.

Hydathode (Water Stomata): Hydathode is a secretory tissue commonly found in the leaves of Angiosperms. They are pore-like structures present on the leaf margin through which water is secreted out as droplets. This type of secretion is called Guttation.

The present post describes the Similarities and Differences between Stomata and Hydathodes with a Comparison Table

Similarities between Stomata and Hydathodes

Ø  Both Stomata and Hydathodes are pores which opens to the exterior environment.

Ø  Both are primarily present on leaves.

Ø  Both stomata and hydathodes are completely composed of living cells.

Ø  Both can release water to the atmosphere.

Difference between Stomata and Hydathodes

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