Stomatal closure rate
noun phrasePronunciation: /ˈstɒmətəl ˈkləʊʒər reɪt/
The speed and extent of stomatal aperture reduction in response to environmental stress signals like drought, heat, or high salinity. This physiological response limits water loss through transpiration but also reduces carbon dioxide uptake and photosynthetic capacity.
Plain English
How quickly and completely plant leaf pores shut down during stress to save water.
Etymology & History
Usage
"Rapid stomatal closure rate under drought stress reduced transpirational water loss but simultaneously decreased photosynthetic carbon assimilation rates."
Style guide notes: Report stomatal closure rate with specific time units (seconds to minutes) and quantify as percentage aperture reduction for consistency.
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Related Terms
Frequently Asked Questions
What signals trigger stomatal closure during stress?
Abscisic acid hormone, leaf water potential decrease, and air vapor pressure deficit all trigger rapid stomatal closure responses.
How does fast stomatal closure affect overall plant performance?
While reducing water loss, fast closure decreases photosynthesis and growth, creating a trade-off between survival and productivity.
Why Test Candidates on This?
Fundamental parameter in drought tolerance screening, water-use efficiency evaluation, and predicting plant performance under environmental stress conditions.
Required skill level: Junior