Freezing tolerance mechanism
nounPronunciation: /ˈfriːzɪŋ ˈtɒlərəns ˈmɛkənɪzəm/
The physiological and biochemical adaptations that prevent ice crystal formation in cells or allow controlled extracellular ice formation without cellular damage during freezing stress. Key mechanisms include production of cryoprotective compounds and cell wall modifications.
Plain English
The biological processes that prevent ice crystals from damaging plant cells during freezing temperatures.
Etymology & History
Usage
"Overwintering buds activate freezing tolerance mechanisms through dehydration and accumulation of sugars and proteins."
Style guide notes: Use 'freezing tolerance' for capacity and 'freezing stress' for the environmental condition.
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Related Terms
Frequently Asked Questions
How do antifreeze proteins help plants survive freezing?
They lower the ice nucleation temperature, preventing spontaneous ice formation and limiting ice crystal size.
Can tropical plants develop freezing tolerance quickly?
Most tropical plants lack genetic capacity for rapid acclimation and die quickly in unexpected freeze events.
Why Test Candidates on This?
Highly relevant for plant breeding, agricultural resilience, and molecular plant physiology assessments.
Required skill level: Mid