Stomatal conductance limitation
nounPronunciation: /stoʊˈmeɪtəl kənˈdʌktəns ˈlɪməˌteɪʃən/
Reduction in stomatal aperture and subsequent decrease in gas exchange capacity that occurs under abiotic stress to minimize water loss. This response involves both biochemical signaling through abscisic acid and direct hydraulic feedbacks from reduced leaf water potential.
Plain English
The narrowing of leaf pores to reduce water loss when plants face environmental stress like drought or heat.
Etymology & History
Usage
"Stomatal conductance limitation reduced photosynthetic rate and contributed to yield losses in rain-fed maize."
Style guide notes: Use 'conductance' for opening and 'limitation' when stress-induced; avoid conflating with stomatal resistance.
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Frequently Asked Questions
How does abscisic acid trigger stomatal conductance limitation?
ABA binds to guard cell receptors, initiating ion efflux and water loss that closes stomata.
What is the trade-off of stomatal conductance limitation?
While water loss decreases, carbon dioxide uptake also declines, reducing photosynthesis and plant growth.
Why Test Candidates on This?
Highly relevant for understanding photosynthetic responses to multiple abiotic stresses in field conditions.
Required skill level: Junior