cavitation event
nounPronunciation: /kævɪˈteɪʃən ɪˈvent/
The formation and collapse of air bubbles within plant xylem vessels when water tension exceeds the cohesive strength of the water column. This phenomenon disrupts water transport and can lead to vessel dysfunction under severe drought conditions.
Plain English
When the water column in plant water-conducting tubes breaks apart, forming air bubbles that block water movement.
Etymology & History
Usage
"Severe drought triggered widespread cavitation events in the mature xylem vessels, rendering affected branches non-functional."
Style guide notes: Distinguish from air seeding by specifying whether the air originated from outside the xylem or from nucleation within it.
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Related Terms
Frequently Asked Questions
Are cavitation events reversible in plants?
Partial refilling can occur during recovery periods, but cavitated vessels typically remain non-functional permanently.
Which plants are most resistant to cavitation?
Species with narrow xylem vessels and thick pit membranes, like desert shrubs and some conifers, show greater cavitation resistance.
Why Test Candidates on This?
Critical for evaluating plant hydraulic vulnerability and predicting species survival under extreme drought scenarios.
Required skill level: Mid