redox homeostasis disruption
noun phrasePronunciation: /ˈriːdɑːks ˌhoʊmioʊˈsteɪsɪs dɪsˈrʌpʃən/
The imbalance between reactive oxygen species (ROS) production and antioxidant scavenging capacity under abiotic stress, resulting in cellular oxidative damage to lipids, proteins, and nucleic acids. This disruption is a central mechanism linking stress perception to cellular dysfunction and programmed cell death.
Plain English
When abiotic stress causes damaging free radicals to overwhelm the plant's natural protective antioxidant defenses.
Etymology & History
Usage
"Redox homeostasis disruption was evident in heat-stressed rice leaves, showing elevated malondialdehyde levels and compromised catalase activity."
Style guide notes: Quantify disruption using specific biomarkers (MDA, protein carbonyls, lipid peroxidation) and antioxidant enzyme activities for clarity.
Also known as
Contrasted with
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Frequently Asked Questions
What causes redox homeostasis disruption during stress?
Abiotic stress increases ROS generation from photosynthesis and respiration while downregulating antioxidant enzyme expression.
How do plants restore redox balance?
Upregulation of antioxidant enzymes like SOD, catalase, and peroxidase, plus increased non-enzymatic antioxidant synthesis restores homeostasis.
Why Test Candidates on This?
Highly tested across plant physiology, biochemistry, and stress biology curricula as a fundamental stress response mechanism.
Required skill level: Mid