Antioxidant system upregulation
nounPronunciation: /ˌæntiˈɒksɪdənt ˈsɪstəm ˌʌprɛɡjəˈleɪʃən/
The enhanced expression and activity of enzymatic and non-enzymatic antioxidants (catalase, superoxide dismutase, glutathione, ascorbate) in response to oxidative stress. This coordinated response protects cellular components from damage caused by excessive reactive oxygen species.
Plain English
The plant's increased production of protective molecules that neutralize harmful reactive oxygen species during stress.
Etymology & History
Usage
"Heat-stressed plants showed significant antioxidant system upregulation, with SOD activity increasing 3.5-fold."
Style guide notes: Specify individual enzymes when possible; avoid vague references to 'total antioxidant activity' without detailed breakdown.
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Frequently Asked Questions
What triggers antioxidant system upregulation in plants?
Elevated ROS levels activate stress signaling pathways that increase transcription of antioxidant enzyme genes.
How quickly does antioxidant upregulation occur?
Initial responses occur within hours; maximum enzyme activity typically peaks within 24-48 hours of stress exposure.
Why Test Candidates on This?
Central to molecular plant physiology and stress biology assessments; critical for understanding plant survival mechanisms.
Required skill level: Mid