Stomatal conductance modulation
nounPronunciation: /ˈstoʊmətəl kənˈdʌktəns ˈmɒdʒəˌleɪʃən/
The dynamic regulation of stomatal aperture and gas exchange capacity in response to environmental stress signals, mediated by guard cell turgor pressure changes, abscisic acid signaling, and hydraulic conductivity adjustments. This process balances carbon dioxide uptake with water loss prevention.
Plain English
Plants adjust the opening and closing of tiny leaf pores to control water loss and gas exchange during stress.
Etymology & History
Usage
"Stomatal conductance modulation under water deficit conditions was genotypically variable across the rice accession panel."
Style guide notes: Use 'stomatal conductance' for quantitative gas exchange rate; 'stomatal modulation' emphasizes the dynamic regulatory process.
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Related Terms
Frequently Asked Questions
How do plants sense drought stress for stomatal closure?
Roots detect water deficit and signal leaves via abscisic acid, triggering guard cell changes and stomatal closure.
What is the trade-off of stomatal closure?
While conserving water, stomatal closure reduces CO2 uptake and photosynthesis, limiting growth and yield.
Why Test Candidates on This?
Essential for understanding water-use efficiency, drought tolerance mechanisms, and identifying cultivars with favorable transpiration-photosynthesis trade-offs.
Required skill level: Mid