Ultraviolet-B Stress Syndrome
nounPronunciation: /ˌʌltrəˌvaɪələt ˈbiː ˈstrɛs ˈsɪndroʊm/
A constellation of cellular and physiological damage patterns resulting from excessive exposure to UV-B radiation, characterized by DNA damage, protein photodamage, and impaired photosynthetic efficiency. Plants respond through increased synthesis of UV-protective compounds and upregulation of DNA repair mechanisms.
Plain English
Plant damage and responses caused by exposure to harmful ultraviolet-B radiation from sunlight.
Etymology & History
Usage
"Alpine vegetation exposed to elevated UV-B stress syndrome exhibits increased production of flavonoids and reduced photosynthetic output."
Style guide notes: Always hyphenate 'UV-B' when referring to specific wavelength; distinguish from general solar radiation effects.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What damages do plants incur from UV-B exposure?
DNA strand breaks, protein crosslinking, photosynthetic apparatus damage, and lipid peroxidation occur, reducing plant fitness and growth.
How do plants defend against UV-B stress?
Plants synthesize flavonoids, anthocyanins, accumulate mycosporines, activate DNA repair pathways, and modify leaf structure for photoprotection.
Why Test Candidates on This?
Evaluated in studies on climate change impacts, ozone depletion effects, and high-altitude plant ecology.
Required skill level: Mid