Hydraulic conductivity reduction
nounPronunciation: /haɪˈdrɔːlɪk kənˈdʌktɪvɪti rɪˈdʌkʃən/
The decreased ability of plant vascular tissues to transport water, occurring under drought or freezing stress due to xylem cavitation or pit aspiration. This phenomenon significantly impairs water movement from roots to shoots, exacerbating water deficit stress.
Plain English
When a plant's water-transport tubes become clogged or damaged, reducing water flow from roots to leaves.
Etymology & History
Usage
"Hydraulic conductivity reduction during drought limits water supply to photosynthetic tissues, forcing stomatal closure."
Style guide notes: Distinguish between xylem cavitation (air entry) and embolism (air-filled vessel) in technical writing.
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Related Terms
Frequently Asked Questions
What causes hydraulic conductivity reduction in plants?
Xylem cavitation (air bubble formation) and pit aspiration that block water-conducting vessels during drought or freeze stress.
How do plants recover from hydraulic conductivity reduction?
Through embolism repair mechanisms involving root pressure and new xylem formation during favorable water conditions.
Why Test Candidates on This?
Critical for understanding plant water relations failure mechanisms in abiotic stress research.
Required skill level: Senior