Fluorescence quenching
nounPronunciation: /ˈflʊərɛsəns ˈkwɛnʃɪŋ/
The reduction of chlorophyll fluorescence intensity resulting from energy dissipation through non-photochemical pathways during photosynthetic stress. This process indicates the plant's capacity to safely dissipate excess light energy and is measured to assess photosynthetic efficiency and stress adaptation.
Plain English
A decrease in light emission from plant chlorophyll when plants safely release extra light energy under stress conditions.
Etymology & History
Usage
"Non-photochemical fluorescence quenching increased substantially in heat-stressed plants, demonstrating enhanced photoprotective capacity."
Style guide notes: Distinguish between 'non-photochemical quenching' (NPQ) and 'photochemical quenching' (qP) in detailed discussions; NPQ is more stress-related.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How is fluorescence quenching measured?
Using pulse amplitude modulation fluorometry that tracks chlorophyll fluorescence under varying light and stress conditions.
What does high fluorescence quenching indicate about stress tolerance?
Strong photoprotective mechanisms and better capacity to prevent photoinhibition under environmental stress.
Why Test Candidates on This?
Advanced phenotyping tool for assessing photosynthetic stress responses and identifying stress-resilient genotypes.
Required skill level: Senior