Stomatal conductance regulation
nounPronunciation: /stəˈmeɪtəl kənˈdʌktəns ˌrɛɡjuˈleɪʃən/
The dynamic control of stomatal aperture to balance water conservation with photosynthetic gas exchange under environmental stress. This regulation involves abscisic acid signaling, turgor-driven guard cell mechanisms, and hydraulic feedback that restricts water loss while maintaining carbon dioxide availability.
Plain English
Plants control the opening and closing of leaf pores to save water while still getting carbon dioxide for photosynthesis.
Etymology & History
Usage
"Stomatal conductance regulation under drought stress is mediated by abscisic acid accumulation in guard cells."
Style guide notes: Distinguish between stomatal conductance (opening measure) and transpiration rate; specify stress conditions affecting regulation.
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Frequently Asked Questions
What hormone triggers stomatal closure during drought?
Abscisic acid signals guard cells to close stomata, reducing water loss during water-limited conditions.
How do guard cells sense water availability?
Guard cells monitor osmotic potential and hydraulic pressure through ion channel responses and turgor changes.
Why Test Candidates on This?
Central to understanding plant water conservation strategies and drought adaptation mechanisms.
Required skill level: Mid