Osmotic Potential Decline
noun phrasePronunciation: /ɑːzˈmɑːtɪk pəˈtenʃəl dɪˈklaɪn/
The reduction in water potential of plant cells due to accumulated solutes, enabling continued water uptake under water-deficit conditions. This mechanism allows plants to maintain turgor pressure and cellular functions during drought stress.
Plain English
Plants accumulate salts and sugars to lower their water potential, allowing them to extract water from dry soil.
Etymology & History
Usage
"Osmotic potential decline in desert plants enables survival through extended drought periods by maintaining water availability."
Style guide notes: Use 'osmotic potential decline' rather than 'osmotic adjustment' when describing the quantitative change in water potential.
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Related Terms
Frequently Asked Questions
How does osmotic potential decline help plants survive drought?
It lowers cell water potential, allowing plants to extract water from increasingly dry soil and maintain turgor.
What solutes contribute to osmotic potential decline?
Sugars, amino acids, organic acids, and mineral ions accumulate in vacuoles to decrease osmotic potential.
Why Test Candidates on This?
Critical for understanding plant water relations and drought stress physiology in research assessments.
Required skill level: Mid