Heat stress tolerance threshold
noun phrasePronunciation: /hiːt strɛs ˈtɒlərəns ˈθrɛʃəʊld/
The maximum temperature at which a plant can maintain critical physiological functions without irreversible damage to cellular structures and metabolic processes. This threshold varies by species, developmental stage, and acclimation history.
Plain English
The highest temperature a plant can survive before suffering permanent damage.
Etymology & History
Usage
"Wheat cultivars with higher heat stress tolerance thresholds demonstrate enhanced grain yield stability during summer heatwaves."
Style guide notes: Always capitalize when referring to specific experimental thresholds; use °C or K for temperature values.
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Frequently Asked Questions
How is heat stress tolerance threshold measured in plant research?
Measured using chlorophyll fluorescence, ion leakage assays, and survival rates at incrementally higher temperatures.
Does heat stress tolerance threshold vary between plant species?
Yes, thresholds differ significantly; tropical species tolerate higher temperatures than temperate zone crops.
Why Test Candidates on This?
Essential for evaluating crop breeding programs and predicting agricultural productivity under climate change scenarios.
Required skill level: Mid