Oxidative stress tolerance
nounPronunciation: /ɒkˈsɪdeɪtɪv ˈstres ˈtɒl(ə)r(ə)ns/
The capacity of plants to withstand and neutralize reactive oxygen species (ROS) accumulation through antioxidant enzyme systems and non-enzymatic defense mechanisms. This tolerance is critical for survival under environmental stresses like high temperature, drought, and salinity.
Plain English
A plant's ability to handle and neutralize harmful oxygen molecules that accumulate during environmental stress.
Etymology & History
Usage
"Enhanced oxidative stress tolerance in transgenic wheat lines correlated with improved heat stress survival rates."
Style guide notes: Distinguish between enzymatic defenses (catalase, SOD, peroxidase) and non-enzymatic defenses (glutathione, carotenoids) when describing tolerance mechanisms.
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Frequently Asked Questions
What are reactive oxygen species and why are they problematic?
ROS are unstable molecules like superoxide and hydrogen peroxide that damage proteins, lipids, and DNA when accumulated excessively.
How do antioxidant enzymes provide stress tolerance?
Enzymes like catalase and superoxide dismutase convert harmful ROS into less reactive compounds like water and oxygen.
Why Test Candidates on This?
Extensively tested in plant physiology, molecular biology, and abiotic stress management courses.
Required skill level: Mid