Summary
Combines solute and pressure potential to predict water movement into and between plant cells.
In depth
Ψ = Ψs + Ψp, measured in kPa or MPa. Pure water has Ψ = 0; solutes lower Ψs; pressure raises Ψp. Water moves from higher to lower Ψ, soil to root to leaf to air. Plasmolysis occurs at Ψp = 0.
Water potential is lower in cells with more solutes, drawing water in. Turgor pressure rises until it balances. Osmotic adjustment lets plants tolerate drought.
Key idea: water always moves from higher (less negative) to lower (more negative) potential.
Frequently asked questions
What is Plant Water Potential?
Combines solute and pressure potential to predict water movement into and between plant cells.
Which area of biology covers Plant Water Potential, and how advanced is it?
Plant Water Potential is one of the 56 topics in Plant Biology. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Abscisic Acid and Drought, Xylem, Plant Cell Wall Biosynthesis.
Can you give an example of Plant Water Potential?
Potato tissue in sucrose solutions finds the cell's water potential.
What should I learn before Plant Water Potential?
Work through the Beginner topics in Plant Biology first, such as Plant Kingdom, Photosynthesis, Chlorophyll, then return to Plant Water Potential. Advanced topics assume the Intermediate vocabulary.
What topics are related to Plant Water Potential?
The closest topics to Plant Water Potential are Abscisic Acid and Drought, Xylem, Plant Cell Wall Biosynthesis, Translocation. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Plant Water Potential?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Plant Water Potential. To practise the whole of Plant Biology, use the Plant Biology quiz.
How is Plant Water Potential different from Abscisic Acid and Drought?
Plant Water Potential: Combines solute and pressure potential to predict water movement into and between plant cells. Abscisic Acid and Drought: ABA triggers guard cell closure and gene responses that help plants survive water stress. Read both side by side and note what each one explains.
How should I study Plant Water Potential step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Abscisic Acid and Drought and explain the difference aloud. Finally, take the Plant Biology quiz and come back to this page for any question you miss.