stomatal conductance decline
noun phrasePronunciation: /stoʊˈmeɪtəl kənˈdʌktəns dɪˈklaɪn/
The reduction in the plant's ability to exchange gases through stomatal apertures, measured as decreased stomatal conductance under abiotic stress conditions. This response limits water loss but also reduces CO2 uptake and photosynthetic capacity.
Plain English
A reduction in how easily gases move through tiny pores in plant leaves during environmental stress, limiting water loss and photosynthesis.
Etymology & History
Usage
"Stomatal conductance decline was the primary mechanism limiting photosynthesis in salt-stressed tomato plants."
Style guide notes: Hyphenate 'stomatal-conductance-related' when modifying nouns; use lowercase in running text.
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Frequently Asked Questions
Why do plants close stomata under drought?
Stomatal closure reduces transpirational water loss, preserving soil water availability for uptake by roots.
What is the trade-off of stomatal conductance decline?
Lower water loss is offset by reduced CO2 entry and decreased photosynthetic rate and productivity.
Why Test Candidates on This?
Fundamental concept in plant physiology assessments, especially relevant for understanding drought and salt stress mechanisms.
Required skill level: Junior