Xylem cavitation susceptibility
nounPronunciation: /ˈzaɪləm kævɪˈteɪʃən səsˈsɛptɪbɪlɪti/
The tendency of water columns in xylem vessels to break under tension, causing air embolism formation that interrupts water transport. This susceptibility increases with drought severity and is genetically determined by vessel anatomy and pit membrane properties.
Plain English
How easily water in plant vascular tubes breaks into bubbles that block water transport during dry conditions.
Etymology & History
Usage
"Oak species show high xylem cavitation susceptibility compared to drought-adapted pines, limiting their range in arid regions."
Style guide notes: Report cavitation susceptibility using water potential at 50% loss of conductivity (P₅₀) in megapascals.
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Related Terms
Frequently Asked Questions
What causes xylem cavitation during drought stress?
Water tension increases as soil dries, eventually exceeding the strength of water column cohesion and forming air bubbles.
Can plants recover from xylem cavitation?
Some species refill embolized vessels in spring using stored sugars, but cavitation represents a significant mortality risk.
Why Test Candidates on This?
Critical for predicting forest dieback and species distribution shifts under climate change and prolonged drought.
Required skill level: Senior