Anoxia
nounPronunciation: /ænˈɒksiə/
Complete absence of oxygen in the rhizosphere or plant tissues, creating anaerobic conditions that force metabolic shift from aerobic respiration to fermentation. This severe stress rapidly depletes ATP and accumulates toxic fermentation byproducts.
Plain English
Total lack of oxygen around roots or in plant tissues, forcing cells to switch to inefficient anaerobic metabolism.
Etymology & History
Usage
"Wetland plants like mangroves possess specialized root aerenchyma tissues to prevent anoxia in waterlogged soils."
Style guide notes: Reserve 'anoxia' for complete oxygen absence; use 'hypoxia' when oxygen is reduced but measurable.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
Why is anoxia more damaging than hypoxia to plants?
Anoxia prevents any aerobic ATP generation, forcing complete dependence on inefficient fermentation that produces toxic ethanol and acetaldehyde.
How do wetland plants survive anoxic root environments?
Specialized adaptations include aerenchyma for oxygen transport, alternative respiration pathways, and ethanol tolerance mechanisms in root tissues.
Why Test Candidates on This?
Essential for understanding flood tolerance, crop performance in poorly drained soils, and wetland plant physiology.
Required skill level: Mid