Thermal Dissipation Quenching
nounPronunciation: /ˈθɜːrməl dɪˈsɪpeɪʃən ˈkwɛntʃɪŋ/
A photoprotective mechanism by which excess light energy captured by chlorophyll is harmlessly converted to heat through the xanthophyll cycle and dissipated in the thylakoid membrane. This prevents photoinhibition and oxidative stress under high light and thermal stress.
Plain English
Plants convert dangerous excess light energy into heat to avoid damage to their photosynthetic machinery.
Etymology & History
Usage
"Thermal dissipation quenching efficiency, measured as non-photochemical quenching (NPQ), increases significantly in heat-tolerant wheat genotypes."
Style guide notes: NPQ is acceptable abbreviation after first mention; distinguish from photochemical quenching (qP).
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What is the xanthophyll cycle's role in thermal dissipation quenching?
Xanthophyll pigments cycle between states, facilitating light energy dissipation as heat in the thylakoid.
How is thermal dissipation quenching measured in research?
Non-photochemical quenching (NPQ) is quantified using pulse amplitude modulation (PAM) fluorometry.
Why Test Candidates on This?
Advanced topic in photosynthesis research and plant stress physiology for specialized assessments.
Required skill level: Expert