Reactive oxygen species burst
nounPronunciation: /riˈæktɪv ˈɒksɪdʒən ˈspiːʃiːz bɜːst/
A rapid, transient increase in cellular concentrations of free radicals including superoxide and hydroxyl radicals during exposure to abiotic stress. These molecules function as both signaling molecules and damaging agents in stressed plant tissues.
Plain English
A sudden spike in harmful free radicals produced by plant cells in response to stress conditions.
Etymology & History
Usage
"The reactive oxygen species burst observed in heat-stressed leaves preceded the activation of antioxidant defense mechanisms."
Style guide notes: Always specify ROS type (superoxide, hydroxyl, hydrogen peroxide) when describing specific mechanisms.
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Frequently Asked Questions
Why do plants produce reactive oxygen species during stress?
ROS act as stress signals triggering defense responses, though excessive accumulation damages cellular components.
How do plants control reactive oxygen species burst?
Enzymatic antioxidants like catalase and SOD rapidly neutralize ROS, while non-enzymatic compounds provide additional protection.
Why Test Candidates on This?
Fundamental to stress physiology and plant defense mechanism assessments.
Required skill level: Mid