Antioxidant enzyme activity upregulation
nounPronunciation: /ˌæntɪˈɒksɪdənt ˈɛndʒaɪm ækˈtɪvɪti ˌʌprɛɡjəˈleɪʃən/
The increased expression and catalytic activity of protective enzymes including superoxide dismutase, catalase, and peroxidases that neutralize reactive oxygen species during abiotic stress. This coordinated upregulation represents a key defense mechanism preventing oxidative damage to cellular components.
Plain English
Plants increase production of protective enzymes during stress to break down and neutralize harmful reactive oxygen molecules.
Etymology & History
Usage
"Antioxidant enzyme activity upregulation is significantly higher in drought-tolerant wheat varieties compared to susceptible lines."
Style guide notes: Specify enzyme types when multiple are involved; use 'upregulation' for gene/protein level increases and 'activity increase' for catalytic changes.
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Frequently Asked Questions
Which enzymes are upregulated during abiotic stress response?
Superoxide dismutase, catalase, ascorbate peroxidase, and glutathione S-transferases are key enzymes upregulated to combat ROS stress.
How is antioxidant enzyme activity measured in stress research?
Activity is quantified through spectrophotometric assays measuring substrate conversion rates, with results expressed as units per mg protein.
Why Test Candidates on This?
Essential for evaluating stress tolerance mechanisms and identifying biomarkers for selecting stress-resilient plant genotypes.
Required skill level: Mid