Radiant stress
nounPronunciation: /ˈreɪdiənt strɛs/
Environmental stress induced by excessive or imbalanced radiation, including UV-B, UV-A, and visible light wavelengths, that damages nucleic acids, proteins, and pigments. This stress triggers ROS production and activates photomorphogenetic responses including stomatal closure and leaf curling.
Plain English
Excessive or unbalanced light radiation harms plant DNA, proteins, and pigments through direct and indirect mechanisms.
Etymology & History
Usage
"Increased ozone depletion has amplified radiant stress from UV-B radiation in Antarctic plant communities."
Style guide notes: Use 'radiant stress' broadly for multi-wavelength radiation effects; specify 'UV stress' when focusing on ultraviolet wavelengths.
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Related Terms
Frequently Asked Questions
What causes radiant stress in natural environments?
High altitude, low latitude, ozone depletion, and reflective snow surfaces increase UV and visible radiation.
How do plants adapt to radiant stress?
Plants produce UV-absorbing compounds, increase antioxidant production, and modify leaf morphology and orientation.
Why Test Candidates on This?
Radiant stress assessment is relevant for understanding plant responses to climate change and evaluating protective mechanisms in high-altitude and high-latitude ecosystems.
Required skill level: Senior