Cellular dehydration threshold
noun phrasePronunciation: /səˈljuːlər ˌdɛhaɪˈdreɪʃən ˈθreʃhoʊld/
The critical water content level below which plant cells lose functionality and viability, characterized by loss of turgor and membrane damage. This threshold varies among species and determines the minimum moisture requirement for survival.
Plain English
The point at which plant cells lose too much water to survive and function properly.
Etymology & History
Usage
"Xerophytic species have lower cellular dehydration thresholds, enabling survival in extremely arid environments."
Style guide notes: Specify measurement units (MPa or water potential) when quantifying threshold values.
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Frequently Asked Questions
Why do some plants survive drier conditions than others?
Species with lower dehydration thresholds maintain cell function at reduced water content through osmotic adjustment.
How is this threshold measured experimentally?
Researchers monitor cell viability and turgor loss at progressively lower water potentials.
Why Test Candidates on This?
Key parameter in drought tolerance assessment and screening programs for stress-adapted cultivars.
Required skill level: Mid