ROS accumulation cascade
noun phrasePronunciation: /ˈɑːrɑːs əˈkjuːmjəˌleɪʃən ˈkæskeɪd/
A sequential buildup of reactive oxygen species (superoxide, hydrogen peroxide, hydroxyl radicals) in plant cells during abiotic stress, initiated by disrupted electron transport chains in chloroplasts and mitochondria. Uncontrolled ROS accumulation leads to oxidative damage of lipids, proteins, and nucleic acids.
Plain English
A chain reaction where harmful oxygen compounds build up inside stressed plant cells, causing damage to cellular structures.
Etymology & History
Usage
"Heat-stressed tomato plants exhibit a ROS accumulation cascade that activates multiple antioxidant defense pathways."
Style guide notes: Always spell out ROS in first mention; 'ROS accumulation cascade' is preferred over 'ROS cascade' for specificity.
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Frequently Asked Questions
What initiates a ROS accumulation cascade in plants?
Disruption of photosynthetic and respiratory electron transport chains during stress conditions diverts electrons to oxygen molecules, creating reactive species.
How do plants limit ROS accumulation cascades?
Antioxidant systems including catalase, superoxide dismutase, and ascorbate-glutathione cycle enzymes neutralize reactive oxygen species.
Why Test Candidates on This?
Essential topic in plant stress physiology and molecular responses to environmental challenges.
Required skill level: Mid