water stoma
Definition
Noun: A specialized pore, typically found on the leaf edges or surfaces of vascular plants, that secretes or exudes liquid water in a process called guttation. This structure is a type of hydathode.
Usage
The term "water stoma" is a technical botanical term. It is used to describe a specific anatomical feature involved in the passive release of water, distinct from the gas-exchange function of regular stomata. * The presence of water stomata at the leaf tip allows the plant to release excess water from the roots. * Guttation droplets form at the water stoma.
Advanced Usage
- Physiological Context: Water stomata are often associated with the termination of leaf veins and are involved in root pressure-driven guttation, especially in humid conditions when transpiration is low.
- Structural Distinction: Unlike regular stomata, water stomata are generally permanently open and do not regulate their aperture.
Variants and Related Words
- Hydathode: This is the more precise and commonly used synonym in botanical science, referring to the entire secretory structure of which the water stoma is often a part.
- Stoma (pl. Stomata): A general term for a pore, but one primarily used for pores on leaves and stems that regulate gas exchange (CO2, O2) and transpiration (water vapor). The "water stoma" is a specific, functionally different type.
Synonyms
- Hydathode
- Water pore
Related Phrases
- To exhibit guttation: The process performed by water stomata/hydathodes.
- The grass blades exhibited guttation in the early morning.
Noun
-
a pore that exudes water on the surface or margin of a leaf of higher plants
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