chilling injury threshold
nounPronunciation: /ˈtʃɪlɪŋ ˈɪndʒəri ˈθreʃoʊld/
The minimum temperature below which cold-sensitive plants experience irreversible cellular damage, typically occurring between 0-15°C depending on species and acclimation state. This threshold determines the survival capacity of subtropical and tropical species under unexpected cold exposure.
Plain English
The specific cold temperature at which tropical and subtropical plants begin to suffer permanent damage to their cells.
Etymology & History
Usage
"Tomato seedlings exhibited chilling injury thresholds of 8°C, below which necrosis developed within 48 hours of exposure."
Style guide notes: Always specify species, cultivar, and developmental stage when reporting thresholds; note acclimation history impact.
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Frequently Asked Questions
How is chilling injury threshold determined experimentally?
Plants are exposed to decreasing temperatures while monitoring for visible damage, ion leakage, and photosynthetic dysfunction markers.
Does cold acclimation lower the chilling injury threshold?
Yes, pre-exposure to mild cold can lower thresholds by 2-5°C through cellular osmolyte accumulation and membrane modifications.
Why Test Candidates on This?
Chilling injury thresholds are critical for horticultural applications and predicting crop losses in unexpected cold weather events.
Required skill level: Mid