Thermal stress threshold
nounPronunciation: /ˈθɜːrməl ˈstrɛs ˈθrɛʃhoʊld/
The critical temperature point beyond which plants experience irreversible damage to cellular structures, enzyme function, and membrane integrity. This threshold varies by species, developmental stage, and prior thermal acclimation history.
Plain English
The maximum or minimum temperature a plant can tolerate before suffering permanent damage.
Etymology & History
Usage
"The thermal stress threshold for wheat seedlings increased by 2.3°C after a week of heat hardening treatment."
Style guide notes: Specify whether referring to high or low thermal stress threshold when context is ambiguous.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
Can plants increase their thermal stress threshold?
Yes, through heat acclimation processes involving heat shock proteins and membrane lipid restructuring over days to weeks.
How is thermal stress threshold measured scientifically?
Using electrolyte leakage assays, chlorophyll fluorescence, and survival measurements after controlled temperature exposure.
Why Test Candidates on This?
Essential for evaluating climate resilience and predicting crop performance under extreme temperature events.
Required skill level: Mid