Xylem cavitation vulnerability
noun phrasePronunciation: /ˈzaɪləm ˌkævɪˈteɪʃən ˈvʌlnərəbɪlɪti/
The susceptibility of a plant's water transport system to air bubble formation within xylem vessels when water stress causes tension in the transpiration stream. This phenomenon can interrupt water delivery and impair plant performance under drought.
Plain English
The tendency of water to break apart inside plant transport tubes under extreme drought stress, creating air pockets that block water movement.
Etymology & History
Usage
"Species with high xylem cavitation vulnerability typically wilt rapidly under severe drought conditions."
Style guide notes: Distinguish between vulnerability metrics (P50, P88) when quantifying cavitation thresholds.
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Frequently Asked Questions
What causes xylem cavitation in plants?
Extreme water stress increases xylem tension, causing dissolved air to form bubbles that break the water column in vessels.
How do plants recover from xylem cavitation?
Some species refill embolized vessels using root pressure or metabolic processes, while others rely on new xylem formation.
Why Test Candidates on This?
Critical for understanding drought tolerance mechanisms and predicting plant survival in arid environments.
Required skill level: Senior