Drought-Induced Stomatal Closure
nounPronunciation: /ˈdraʊt ɪnˈdjuːst stəˈmeɪtəl ˈkloʊʒər/
The physiological mechanism by which plants restrict stomatal aperture in response to water deficit, reducing transpirational water loss while limiting CO₂ uptake. This adaptive response is regulated by abscisic acid signaling and represents a critical trade-off between water conservation and photosynthetic carbon assimilation.
Plain English
Plants close their leaf pores during dry conditions to save water, even though this reduces their ability to take in carbon dioxide.
Etymology & History
Usage
"Drought-induced stomatal closure protects plants from desiccation but simultaneously reduces photosynthetic efficiency under water-limiting conditions."
Style guide notes: Hyphenate 'drought-induced' when used as a compound modifier before the noun.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
Why do plants close stomata during drought?
To minimize water loss through transpiration and prevent severe desiccation stress that could damage cellular tissues.
What signaling molecule controls stomatal closure?
Abscisic acid (ABA) is the primary plant hormone that triggers stomatal closure in response to water deficit stress signals.
Why Test Candidates on This?
Frequently tested in plant physiology and drought-stress adaptation assessments across undergraduate and graduate curricula.
Required skill level: Junior