Xylem cavitation event
nounPronunciation: /ˈzaɪləm kævɪˈteɪʃən ɪˈvent/
The formation of air-filled cavities within xylem vessels when water columns break under tension, disrupting water transport from roots to shoots. This process is reversible in some species but can cause permanent loss of conducting capacity.
Plain English
The breaking of water columns in plant vessels that interrupts water movement from roots to leaves.
Etymology & History
Usage
"Xylem cavitation events limit water transport capacity during severe drought, contributing to plant hydraulic failure."
Style guide notes: Distinguish between cavitation events (singular air entry) and embolism (sustained loss of function).
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What causes xylem cavitation during drought?
Water tension increases as soil dries, eventually exceeding the cohesive strength of water columns, causing them to break.
Can plants recover from xylem cavitation?
Some species can refill cavitated vessels through root pressure, but others suffer permanent loss of vessel function.
Why Test Candidates on This?
Essential for understanding drought-induced plant mortality mechanisms in advanced physiology courses.
Required skill level: Senior