Stomatal conductance reduction
nounPronunciation: /stəˈmeɪtəl kənˈdʌktəns rɪˈdʌkʃən/
The physiological closure or narrowing of stomatal apertures in response to abiotic stress, decreasing leaf gas conductance and water vapor loss through transpiration. This mechanism represents a primary drought or flood stress avoidance strategy.
Plain English
The narrowing of leaf pores to reduce water loss and gas exchange during environmental stress.
Etymology & History
Usage
"Stomatal conductance reduction occurred within minutes of water deficit detection, limiting transpirational water loss."
Style guide notes: Distinguish between 'stomatal conductance' (the inverse of resistance) and 'stomatal resistance' when quantifying responses.
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Related Terms
Frequently Asked Questions
How quickly does stomatal conductance reduction occur under stress?
Initial responses occur within minutes through abscisic acid signaling, with full closure developing over hours under sustained stress.
What triggers stomatal conductance reduction?
Leaf water deficit, abscisic acid accumulation, and soil drought signals trigger guard cell contraction and stomatal closure.
Why Test Candidates on This?
Critical assessment metric for drought tolerance evaluation and stress physiology research across crop species.
Required skill level: Mid