Desiccation tolerance threshold
nounPronunciation: /ˌdesɪˈkeɪʃən ˈtɒlərəns ˈθreʃˌhoʊld/
The critical minimum water content level below which plant tissues sustain irreversible cellular damage and cannot recover upon rehydration. This threshold varies among species and is a key determinant of drought survival capacity.
Plain English
The lowest water level a plant can reach before it dies permanently, even if given water again.
Etymology & History
Usage
"Resurrection plants maintain desiccation tolerance thresholds below 10% relative water content, enabling survival in extreme drought."
Style guide notes: Distinguish from wilting point; threshold indicates non-recovery point while wilting may be reversible.
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Related Terms
Frequently Asked Questions
Can plants recover after reaching desiccation tolerance threshold?
No; this threshold marks irreversible damage where rehydration cannot restore viability or function.
How do resurrection plants survive below normal thresholds?
They possess specialized cellular mechanisms protecting proteins and membranes during extreme dehydration.
Why Test Candidates on This?
Common in advanced plant drought physiology and abiotic stress adaptation studies.
Required skill level: Mid