Photoprotective pigment accumulation
noun phrasePronunciation: /ˌfoʊtoʊprəˈtɛktɪv ˈpɪɡmənt əˌkjuːmjəˈleɪʃən/
The synthesis and localization of non-photosynthetic pigments such as anthocyanins, carotenoids, and flavonoids in plant tissues under environmental stress conditions, which dissipate excess light energy and neutralize reactive oxygen species. This mechanism prevents photoinhibition and photosynthetic damage during stress.
Plain English
The buildup of protective colored compounds in plants that shield them from light damage during stress by absorbing excess energy.
Etymology & History
Usage
"Photoprotective pigment accumulation in alpine plants includes elevated anthocyanins in epidermal cells reducing photosynthetically active radiation transmission."
Style guide notes: Specify pigment type and cellular localization; note that some photoprotective pigments (xanthophyll cycle) overlap photosynthetic machinery.
Also known as
Contrasted with
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Frequently Asked Questions
Why do plants accumulate anthocyanins under stress?
Anthocyanins screen excess light, function as antioxidants, and may signal defense status to herbivores and pathogens.
Which stresses trigger photoprotective pigment synthesis?
High irradiance, cold stress, UV radiation, nutrient deficiency, and drought all induce photoprotective pigment accumulation.
Why Test Candidates on This?
Relevant for assessing plant responses to combined light and other stresses, and for understanding visible stress indicators in field conditions.
Required skill level: Senior