Stomatal closure
nounPronunciation: /ˈstoʊmətəl ˈkloʊʒər/
The process by which guard cells reduce stomatal aperture in response to water deficit, heat, or other environmental stresses to minimize transpirational water loss. This is a rapid, reversible response controlled by abscisic acid and other signaling molecules.
Plain English
The narrowing or sealing of microscopic pores on leaves to reduce water loss during plant stress.
Etymology & History
Usage
"Stomatal closure under heat stress reduced photosynthetic carbon assimilation but effectively prevented excessive water loss."
Style guide notes: Capitalize 'Stomatal Closure' only in formal titles; use lowercase in running text.
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Frequently Asked Questions
How quickly does stomatal closure occur in response to stress?
Stomatal closure typically begins within minutes to hours of stress perception, driven by rapid abscisic acid signaling.
What is the trade-off of stomatal closure?
While water conservation increases, carbon dioxide uptake decreases, reducing photosynthesis and plant growth.
Why Test Candidates on This?
Fundamental concept tested in plant physiology, ecology, and agronomy courses worldwide.
Required skill level: Junior