desiccation tolerance mechanism
nounPronunciation: /ˌdesɪˈkeɪʃən ˈtɒlərəns ˈmɛkənɪzəm/
The physiological and molecular adaptations that enable plant tissues or seeds to survive extreme water loss (often below 10% relative water content) without permanent damage. These mechanisms involve structural reinforcement, metabolic quiescence, and protective molecule synthesis.
Plain English
A plant's ability to survive almost complete drying out and resume normal function when water becomes available again.
Etymology & History
Usage
"Seeds exhibit robust desiccation tolerance mechanisms that allow them to remain viable for decades in arid storage conditions."
Style guide notes: Distinguish between desiccation tolerance and desiccation avoidance; tolerance implies recovery after damage.
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Frequently Asked Questions
Which plants have desiccation tolerance mechanisms?
Resurrection plants, orthodox seeds, and some bryophytes possess this trait; most vegetative tissues lack this ability.
How do cells protect themselves during extreme drying?
Cells produce sugars, synthesize protective proteins, and accumulate late embryogenesis abundant (LEA) proteins.
Why Test Candidates on This?
Critical for understanding seed germination biology and crop preservation strategies in climate-stressed regions.
Required skill level: Senior