Stomatal conductance suppression
noun phrasePronunciation: /stəˈmeɪtəl kənˈdʌktəns səˈpreʃən/
The reduction in stomatal opening and conductance to water vapor and CO₂, controlled by abscisic acid and environmental signals during abiotic stress. This response decreases transpirational water loss while simultaneously limiting photosynthetic gas exchange.
Plain English
The closure of leaf pores to reduce water loss during drought, heat, or salt stress.
Etymology & History
Usage
"Stomatal conductance suppression represents an early plant response to water deficit, reducing transpirational demand within minutes."
Style guide notes: Distinguish between rapid turgor-driven responses and slower ABA-mediated stomatal regulation.
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Frequently Asked Questions
How quickly do stomata respond to drought stress?
Stomata can reduce conductance within minutes to hours in response to leaf water deficit signals.
What are drawbacks of stomatal conductance suppression?
Closed stomata limit CO₂ uptake, reducing photosynthesis and potentially limiting growth and yield.
Why Test Candidates on This?
Commonly measured indicator of plant water stress response and drought tolerance in field and controlled experiments.
Required skill level: Junior