heat dissipation coefficient
nounPronunciation: /hiːt dɪˌsɪˈpeɪʃən kəʊˈfɪʃənt/
A quantitative measure of a plant's ability to release excess absorbed radiation energy as heat, preventing photooxidative damage at elevated temperatures. This non-photochemical pathway protects photosynthetic machinery from photoinhibition under heat stress.
Plain English
A measure of how efficiently plants release excess light energy as heat to prevent damage during temperature stress.
Etymology & History
Usage
"Cultivars with higher heat dissipation coefficients maintained photosynthetic efficiency despite temperatures exceeding 40°C."
Style guide notes: Specify measurement conditions (light intensity, temperature range) as the coefficient is context-dependent and variable across species.
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Frequently Asked Questions
Why is heat dissipation important during heat stress?
Dissipating excess light energy prevents formation of reactive oxygen species that damage photosynthetic proteins and pigments.
Can heat dissipation capacity be improved through breeding?
Yes, screening germplasm for high heat dissipation coefficients can identify thermotolerant cultivars for crop improvement programs.
Why Test Candidates on This?
Important for characterizing thermotolerance mechanisms in crops bred for heat-prone regions and predicting climate adaptation potential.
Required skill level: Senior