Antioxidant enzyme upregulation
nounPronunciation: /ˌæntiˈɒksɪdənt ˈɛndʒaɪm ˌʌprɛɡjəˈleɪʃən/
The increased expression and activity of protective enzymes such as superoxide dismutase, catalase, and peroxidase in response to abiotic stress. This adaptive response scavenges reactive oxygen species and prevents oxidative damage to cellular components.
Plain English
Plants produce more protective enzymes to neutralize harmful oxidative substances when facing stress.
Etymology & History
Usage
"Under salt stress, soybean roots show significant antioxidant enzyme upregulation, with SOD activity increasing threefold within 48 hours."
Style guide notes: Always specify enzyme types when discussing upregulation; provide activity measurements in units (U/mg protein).
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Frequently Asked Questions
Which enzymes are primarily upregulated during abiotic stress?
Superoxide dismutase (SOD), catalase (CAT), and peroxidase (POX) are primary antioxidant enzymes upregulated during stress.
How does antioxidant upregulation protect plants?
These enzymes catalyze ROS neutralization, converting superoxide and hydrogen peroxide into non-toxic water and oxygen products.
Why Test Candidates on This?
Highly relevant in stress physiology assessments, molecular response studies, and plant biochemistry examinations across all levels.
Required skill level: Mid