Chromatic adaptation
nounPronunciation: /kroʊˈmætɪk ədæpˈteɪʃən/
The reversible shift in photosynthetic light-harvesting pigment composition in response to changes in light spectral quality, allowing plants to optimize photon capture under shade, high light, or stress conditions. This mechanism involves rapid changes in chlorophyll ratios and antenna protein organization without altering gene expression patterns.
Plain English
Plants adjust their leaf color pigments to capture different colors of light when light conditions change.
Etymology & History
Usage
"Chromatic adaptation enabled shade-grown seedlings to improve photosynthetic efficiency when exposed to full sunlight by increasing carotenoid concentration."
Style guide notes: Reserve 'chromatic adaptation' for spectral quality responses; use 'photoacclimation' for general light intensity adjustments.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How quickly does chromatic adaptation occur?
Changes typically occur within hours to days, much faster than genetic adaptation mechanisms.
Which pigments are primarily adjusted during chromatic adaptation?
Chlorophyll a/b ratios and carotenoid concentrations shift to match prevailing light spectral quality.
Why Test Candidates on This?
Relevant for understanding shade tolerance and light stress responses in forest ecology and controlled environment research.
Required skill level: Senior