Pressure-volume curves

{{short description|Relationship between water potential and relative water content}}In ecology, pressure-volume curves describe the relationship between total water potential (Ψt) and relative water content (R) of living organisms. These values are widely used in research on plant-water relations and provide valuable information on the turgor, osmotic and elastic properties of plant tissues.{{cite journal |last1=Lenz |first1=Tanja I. |last2=Wright |first2=Ian J. |last3=Westoby |first3=Mark |title=Interrelations among pressure–volume curve traits across species and water availability gradients |journal=Physiologia Plantarum |date=July 2006 |volume=127 |issue=3 |pages=423–433 |doi=10.1111/j.1399-3054.2006.00680.x }}{{cite journal |last1=Leuschner |first1=Christoph |last2=Wedde |first2=Paul |last3=Lübbe |first3=Torben |title=The relation between pressure–volume curve traits and stomatal regulation of water potential in five temperate broadleaf tree species |journal=Annals of Forest Science |date=June 2019 |volume=76 |issue=2 |doi=10.1007/s13595-019-0838-7 }}{{cite journal |last1=Corcuera |first1=L. |last2=Camarero |first2=J.J. |last3=Gil-Pelegrín |first3=E. |title=Functional groups in Quercus species derived from the analysis of pressure–volume curves |journal=Trees |date=September 2002 |volume=16 |issue=7 |pages=465–472 |doi=10.1007/s00468-002-0187-1 }}{{cite journal |last1=Kubiske |first1=M. E. |last2=Abrams |first2=M. D. |title=Rehydration effects on pressure-volume relationships in four temperate woody species: variability with site, time of season and drought conditions |journal=Oecologia |date=February 1991 |volume=85 |issue=4 |pages=537–542 |doi=10.1007/BF00323766 |pmid=28312501 }}

According to the Boyle–v'ant Hoff Relation, the product of osmotic potential and volume of solution should be a constant for any given amount of osmotically active solutes in an ideal osmotic system.{{cite book |doi=10.1007/978-3-030-29639-1 |title=Plant Physiological Ecology |date=2019 |last1=Lambers |first1=Hans |last2=Oliveira |first2=Rafael S. |isbn=978-3-030-29638-4 }}{{pn|date=January 2025}}{{cite book |doi=10.1016/B978-012088765-1.50012-9 |chapter=Absorption of Water and Ascent of Sap |title=Physiology of Woody Plants |date=2008 |last1=Pallardy |first1=Stephen G. |pages=287–323 |isbn=978-0-12-088765-1 }}{{Cite web |date=2010-06-30 |title=Leaf pressure-volume curve parameters |url=https://prometheusprotocols.net/function/water-relations/pressure-volume-curves/leaf-pressure-volume-curve-parameters/ |access-date=2025-01-30 |website=PROMETHEUS |language=en-US}}

$\backslash psi\_0\backslash mathit(V)\backslash !$ = A constant

$\backslash psi\_0\backslash !$ is osmotic potential and $\backslash mathit(V)\backslash !$ is volume of solution.

This can then be manipulated to a linear relation which describes the ideal situation:

$\backslash psi\_0\backslash !$ = $\backslash dfrac\{1\}V\backslash !\; \backslash times$ A constant