Antioxidant enzyme system
nounPronunciation: /ˌæntɪˈɒksɪdənt ˈɛnzaɪm ˈsɪstəm/
A coordinated network of enzymatic proteins including superoxide dismutase, catalase, and peroxidases that catalyze the detoxification of harmful free radicals and reactive molecules. This system represents the plant's primary biochemical defense against oxidative damage.
Plain English
Plant cells produce special proteins that work together to neutralize and remove dangerous molecules that damage cell components.
Etymology & History
Usage
"Plants experiencing cold stress upregulate their antioxidant enzyme systems to prevent cellular damage from accumulating free radicals."
Style guide notes: Specify which enzymes when possible; avoid using as catch-all term for all antioxidant mechanisms.
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Frequently Asked Questions
What are the main enzymes in plant antioxidant systems?
Superoxide dismutase, catalase, and glutathione peroxidase form the primary enzymatic defense network.
Why do plants need antioxidant enzymes during stress?
Environmental stresses generate excess free radicals that damage proteins, lipids, and DNA unless enzymatically neutralized.
Why Test Candidates on This?
Core concept in stress physiology exams requiring knowledge of specific enzyme functions and upregulation.
Required skill level: Mid