Turgor loss point
nounPronunciation: /ˈtɜːɡər lɔːs pɔɪnt/
The water potential at which a plant cell loses turgor pressure and becomes permanently plasmolyzed, marking the threshold between reversible and irreversible cellular damage. This critical parameter varies among species and determines drought survival capacity.
Plain English
The water availability level at which plant cells lose their structural firmness and cannot recover even if water returns.
Etymology & History
Usage
"Species with lower turgor loss points demonstrate superior drought tolerance compared to those with higher thresholds."
Style guide notes: Turgor loss point is species-specific; always include comparative context when discussing multiple plant types.
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Frequently Asked Questions
What happens to plants at turgor loss point?
Cells collapse, photosynthesis ceases, and enzyme activity halts, leading to tissue death if rehydration doesn't occur quickly.
How do drought-tolerant plants adjust their turgor loss point?
They accumulate solutes and modify cell wall elasticity, allowing maintained turgor at lower water potentials than sensitive species.
Why Test Candidates on This?
Critical for drought physiology and plant tolerance threshold assessments.
Required skill level: Senior