Transpiration rate suppression threshold
nounPronunciation: /trænspɪˈreɪʃən reɪt səˈpreʃən ˈθreʃoʊld/
The critical leaf water potential level at which plants actively reduce transpiration through stomatal closure to prevent catastrophic water loss. This threshold varies by species and represents a survival mechanism under severe drought.
Plain English
The water stress level at which plants close their pores to stop water loss and survive drying conditions.
Etymology & History
Usage
"Plants with lower transpiration rate suppression thresholds maintain photosynthesis longer during progressive drought."
Style guide notes: Consistently reference measurement units (MPa for water potential) when comparing threshold values across studies.
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Frequently Asked Questions
What signals trigger the transpiration rate suppression threshold?
Declining leaf water potential and root-derived abscisic acid signals activate stomatal closure mechanisms.
How does threshold timing affect drought tolerance?
Earlier closure conserves water but reduces photosynthesis; delayed closure maximizes growth but risks desiccation.
Why Test Candidates on This?
Central to screening drought-tolerant genotypes and predicting crop performance under water limitation.
Required skill level: Mid