Solute Potential Depression
nounPronunciation: /ˈsoːljuːt pəˈtenʃəl dɪˈpreʃən/
The decrease in water potential in plant cells resulting from accumulated solutes including ions, sugars, and amino acids, enabling water retention under drought conditions. This osmotic adjustment enhances cellular turgor maintenance and continued metabolic function despite reduced soil water availability.
Plain English
Plants accumulate dissolved substances in their cells to pull water inward and maintain firmness during drought.
Etymology & History
Usage
"Solute potential depression of -2.5 MPa in the xeric species maintained turgor pressure even when soil water potential reached -3.0 MPa."
Style guide notes: Express solute potential values in MPa with appropriate sign notation (typically negative); specify plant tissue measured.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What solutes contribute to potential depression?
Potassium ions, sugars like glucose, amino acids like proline, and organic acids accumulate during stress.
How does solute potential depression help plants survive drought?
Lower water potential allows water uptake from drier soil and maintains cell turgor for continued function.
Why Test Candidates on This?
Essential concept in plant water relations and drought physiology, commonly assessed through water potential measurements.
Required skill level: Mid