Oxidative stress accumulation
nounPronunciation: /ɒkˈsɪdətɪv ˈstres əˌkjuːmjəˈleɪʃən/
The progressive buildup of reactive oxygen species (ROS) such as superoxide, hydrogen peroxide, and hydroxyl radicals in plant cells exceeding the capacity of antioxidant defense systems. Prolonged accumulation damages proteins, lipids, and nucleic acids, impairing cellular function.
Plain English
Harmful oxygen molecules build up in plant cells faster than the plant can neutralize them.
Etymology & History
Usage
"Oxidative stress accumulation during heat stress overwhelmed the antioxidant system, resulting in cellular damage."
Style guide notes: Standard terminology in plant stress biology; specify ROS types when appropriate.
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Frequently Asked Questions
What is oxidative stress in plants?
Buildup of harmful reactive oxygen species molecules that exceed antioxidant defense capacity.
How do plants protect against oxidative stress?
Enzymes like catalase and superoxide dismutase, plus antioxidant molecules, neutralize harmful oxygen species.
Why Test Candidates on This?
Fundamental concept in plant stress physiology and biochemistry examinations.
Required skill level: Mid