Cellular turgor loss point
noun phrasePronunciation: /ˈseluːlər ˈtɜːɡə lɔːs pɔɪnt/
The critical water potential at which plant cells lose turgor pressure and begin irreversible plasmolysis, marking the threshold between stress acclimation and cellular damage. This species-specific value determines the minimum water availability a plant can tolerate before structural collapse.
Plain English
The water level below which plant cells lose their rigid structure and begin permanent damage.
Etymology & History
Usage
"Desert shrubs exhibit cellular turgor loss points as low as -8 MPa, enabling survival in extremely arid conditions."
Style guide notes: Distinguish from 'permanent wilting point' by specifying cellular-level mechanisms; always include water potential values in MPa when applicable.
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Frequently Asked Questions
How is cellular turgor loss point measured experimentally?
Pressure-volume curves assess water potential changes while monitoring cell turgor until irreversible plasmolysis occurs.
Why do different plant species have different turgor loss points?
Cell wall elasticity, solute accumulation capacity, and evolutionary drought adaptation create species-specific turgor loss point values.
Why Test Candidates on This?
Important for understanding drought tolerance mechanisms, plant water relations, and species-specific stress threshold comparisons.
Required skill level: Mid