Osmotic potential
nounPronunciation: /ɒzˈmɒtɪk pəˈtenʃəl/
The potential energy of water in a solution relative to pure water, determined by the concentration of dissolved solutes that influences water movement across semipermeable membranes. It is a critical parameter in understanding plant water stress responses and drought tolerance mechanisms.
Plain English
The tendency of water to move into or out of plant cells based on dissolved salt and sugar concentrations.
Etymology & History
Usage
"Under drought stress, plants maintain lower osmotic potential through solute accumulation to sustain water uptake."
Style guide notes: Always express osmotic potential as negative values in technical writing; distinguish from total water potential.
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Contrasted with
Related Terms
Frequently Asked Questions
How does osmotic potential change during drought stress?
Osmotic potential becomes more negative as plants accumulate solutes like proline and sugars to maintain water uptake.
Why is osmotic potential important in crop breeding?
Selection for lower osmotic potential enhances drought tolerance by improving water availability under stress conditions.
Why Test Candidates on This?
Osmotic potential is fundamental to understanding plant water relations and abiotic stress tolerance mechanisms tested in breeding programs.
Required skill level: Mid