Cavitation events
nounPronunciation: /ˌkævɪˈteɪʃən ˈɪvɛnts/
The sudden formation of gas-filled voids (embolisms) within xylem vessels when water columns break under tension, interrupting water transport to plant tissues. This phenomenon is particularly critical during drought stress when water potential gradients become extreme.
Plain English
The breaking of water columns inside plant vessels during severe water stress, creating air bubbles that block water transport.
Etymology & History
Usage
"Repeated cavitation events during extreme drought reduced xylem conductivity in the woody shrub by over 80 percent."
Style guide notes: Use 'cavitation events' (plural) when discussing multiple occurrences; 'cavitation' (singular) for the process itself.
Also known as
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Related Terms
Frequently Asked Questions
What triggers cavitation in plant xylem?
Extreme negative water potentials during drought stress create tension exceeding water's cohesive strength, causing column rupture and air invasion.
Can plants reverse xylem cavitation?
Some species can refill cavitated vessels through root pressure and metabolic processes, while others experience permanent conductivity loss.
Why Test Candidates on This?
Cavitation events are critical assessment parameters in woody plant drought resilience and species-specific hydraulic safety margin studies.
Required skill level: Senior