Submergence stress
nounPronunciation: /səbˈmɜːrdʒəns stres/
The physiological challenge imposed on plants by prolonged waterlogging or flooding that restricts oxygen availability to roots, inhibits nutrient uptake, and triggers anaerobic metabolism. This abiotic stress limits plant growth particularly in paddy ecosystems and flood-prone regions.
Plain English
The stress experienced by plants when soil becomes waterlogged or flooded, restricting oxygen to roots and limiting growth.
Etymology & History
Usage
"Rice varieties with submergence stress tolerance carried the Sub1A gene conferring quiescence during flood conditions."
Style guide notes: Use 'submergence stress' for complete water immersion; 'waterlogging stress' for partial saturation conditions.
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Contrasted with
Related Terms
Frequently Asked Questions
What are primary plant responses to submergence stress?
Reduced oxygen triggers anaerobic metabolism, ethylene accumulation, aerenchyma formation, and reduced nutrient absorption capacity.
How do rice varieties survive complete submergence?
Quiescence mechanism reduces growth energy expenditure and lowers water uptake during submergence via Sub1A gene action.
Why Test Candidates on This?
Critical for rice breeding and wetland agriculture examinations assessing flood-tolerance mechanisms in staple crops.
Required skill level: Mid