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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Difference between Transpiration and Guttation – A Comparison Table

Transpiration vs Guttation

Transpiration vs Guttation (A Comparison Table)
(Similarities and Differences between Transpiration and Guttation Process)

Transpiration and Guttation are the two physiological events in plants by which the plants release water to the external atmosphere.

Transpiration: Transpiration is the excessive loss of water from the aerial portion of plants as water vapours. Even though the transpiration results in excessive loss of water, it helps to maintain the continuous absorption water from the soil through a force called the ‘Transpiration Pull’. Thus, the transpiration is considered as a ‘Necessary Evil’ in plants.

Guttation: Guttation is the process of secretion of liquid water through the leaf tips in some plants. These plants possess a specialized structure at their leaf tip and margins called Hydathodes. The guttation usually occurs in the morning time when the atmosphere humidity will be high and the rate of transpiration will be low.

Similarities between Transpiration and Guttation

Ø  Both transpiration and guttation primarily occurs though leaf.

Ø  In both cases, the water is lost through specialized pores.

Ø  Both transpiration and guttation cause permanent water loss from the plant.

Difference between Transpiration and Guttation

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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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