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2. Leaf water potential measurements using the pressure chamber: Synthetic testing of assumptions towards best practices for precision and accuracy

Author

European Commission, Austrian Research Promotion Agency, National Science Foundation (US), Rodríguez Domínguez, Celia M. [0000-0003-2352-0829], Forner, Alicia [0000-0002-7123-6403], Choat, B.[0000-0002-9105-640X], López, Rosana [0000-0003-3553-9148], Peters, J.M.R. [0000-0003-4627-7788], Pfautsch, S. [0000-0002-4390-4195], Carins Murphy, Madeline R. [0000-0003-4370-9485], McAdam, Scott [0000-0002-9625-6750], Richardson, Freya [0000-0003-2460-3423], Díaz-Espejo, Antonio [0000-0002-4711-2494], Hernández Santana, V. [0000-0001-9018-8622], Menezes-Silva, Paulo E. [0000-0002-8122-3489], Torres Ruiz, José Manuel [0000-0003-1367-7056], Sack, Lawren [0000-0002-7009-7202], Rodríguez-Domínguez, Celia M., Forner, Alicia, Martorell, Sebastià, Choat, B., López, Rosana, Peters, J.M.R., Pfautsch, S., Mayr, Stefan, Carins Murphy, Madeline R., McAdam, Scott, Richardson, Freya, Díaz-Espejo, Antonio, Hernández Santana, V., Menezes-Silva, Paulo E., Torres Ruiz, José Manuel, Batz, Timothy A, Sack, Lawren, European Commission, Austrian Research Promotion Agency, National Science Foundation (US), Rodríguez Domínguez, Celia M. [0000-0003-2352-0829], Forner, Alicia [0000-0002-7123-6403], Choat, B.[0000-0002-9105-640X], López, Rosana [0000-0003-3553-9148], Peters, J.M.R. [0000-0003-4627-7788], Pfautsch, S. [0000-0002-4390-4195], Carins Murphy, Madeline R. [0000-0003-4370-9485], McAdam, Scott [0000-0002-9625-6750], Richardson, Freya [0000-0003-2460-3423], Díaz-Espejo, Antonio [0000-0002-4711-2494], Hernández Santana, V. [0000-0001-9018-8622], Menezes-Silva, Paulo E. [0000-0002-8122-3489], Torres Ruiz, José Manuel [0000-0003-1367-7056], Sack, Lawren [0000-0002-7009-7202], Rodríguez-Domínguez, Celia M., Forner, Alicia, Martorell, Sebastià, Choat, B., López, Rosana, Peters, J.M.R., Pfautsch, S., Mayr, Stefan, Carins Murphy, Madeline R., McAdam, Scott, Richardson, Freya, Díaz-Espejo, Antonio, Hernández Santana, V., Menezes-Silva, Paulo E., Torres Ruiz, José Manuel, Batz, Timothy A, and Sack, Lawren

Abstract

eaf water potential (psi(leaf)), typically measured using the pressure chamber, is the most important metric of plant water status, providing high theoretical value and information content for multiple applications in quantifying critical physiological processes including drought responses. Pressure chamber measurements of psi(leaf) (psi(leafPC)) are most typical, yet, the practical complexity of the technique and of the underlying theory has led to ambiguous understanding of the conditions to optimize measurements. Consequently, specific techniques and precautions diversified across the global research community, raising questions of reliability and repeatability. Here, we surveyed specific methods of psi(leafPC) from multiple laboratories, and synthesized experiments testing common assumptions and practices in psi(leafPC) for diverse species: (i) the need for equilibration of previously transpiring leaves; (ii) leaf storage before measurement; (iii) the equilibration of psi(leaf) for leaves on bagged branches of a range of dehydration; (iv) the equilibration of psi(leaf) across the lamina for bagged leaves, and the accuracy of measuring leaves with artificially 'elongated petioles'; (v) the need in psi(leaf) measurements for bagging leaves and high humidity within the chamber; (vi) the need to avoid liquid water on leaf surfaces; (vii) the use of 'pulse' pressurization versus gradual pressurization; and (viii) variation among experimenters in psi(leafPC) determination. Based on our findings we provide a best practice protocol to maximise accuracy, and provide recommendations for ongoing species-specific tests of important assumptions in future studies.

Published
2022

5. Leaf water potential measurements using the pressure chamber: Synthetic testing of assumptions towards best practices for precision and accuracy

Author

Celia M. Rodriguez‐Dominguez, Alicia Forner, Sebastia Martorell, Brendan Choat, Rosana Lopez, Jennifer M. R. Peters, Sebastian Pfautsch, Stefan Mayr, Madeline R. Carins‐Murphy, Scott A. M. McAdam, Freya Richardson, Antonio Diaz‐Espejo, Virginia Hernandez‐Santana, Paulo E. Menezes‐Silva, Jose M. Torres‐Ruiz, Timothy A. Batz, Lawren Sack, Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Museo Nacional de Ciencias Naturales, Departamento de Biogeografía y Cambio Global, Laboratorio Internacional de Cambio Global (LINC-Global), Spanish National Research Council (CSIC), Université des îles Baléares (UIB), Western Sydney University, Departamento de Sistemas y Recursos Naturales, Escuela Técnica Superior de Ingeniería de Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, Madrid, Hawkesbury Institute for the Environment [Richmond] (HIE), Institute of Botany [Innsbruck], Leopold Franzens Universität Innsbruck - University of Innsbruck, School of Biological Sciences [Hobart], University of Tasmania [Hobart, Australia] (UTAS), Purdue University [West Lafayette], Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant (PIAF), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Clermont Auvergne (UCA), Perdue University, Department of Ecology and Evolutionary Biology (Faculty of Biology), University of Science-Vietnam National Universities, SKA South Africa751918-AgroPHYSAustrian Science Fund (FWF)P32203National Science Foundation (NSF)1457279, European Project: 624473,EC:FP7:PEOPLE,FP7-PEOPLE-2013-IOF,HYDROPIT(2015), European Commission, Austrian Research Promotion Agency, National Science Foundation (US), Rodríguez Domínguez, Celia M., Forner, Alicia, Choat, B., López, Rosana, Peters, J.M.R., Pfautsch, S., Carins Murphy, Madeline R., McAdam S.A.M., Richardson, Freya, Díaz-Espejo, Antonio, Hernández Santana, V., Menezes-Silva, Paulo E., Torres Ruiz, José Manuel, Sack, Lawren, Rodríguez Domínguez, Celia M. [0000-0003-2352-0829], Forner, Alicia [0000-0002-7123-6403], Choat, B.[0000-0002-9105-640X], López, Rosana [0000-0003-3553-9148], Peters, J.M.R. [0000-0003-4627-7788], Pfautsch, S. [0000-0002-4390-4195], Carins Murphy, Madeline R. [0000-0003-4370-9485], McAdam S.A.M. [0000-0002-9625-6750], Richardson, Freya [0000-0003-2460-3423], Díaz-Espejo, Antonio [0000-0002-4711-2494], Hernández Santana, V. [0000-0001-9018-8622], Menezes-Silva, Paulo E. [0000-0002-8122-3489], Torres Ruiz, José Manuel [0000-0003-1367-7056], and Sack, Lawren [0000-0002-7009-7202]

Subjects
Physiology, Water stress, Reproducibility of Results, Water, plant water relations, Plant water relations, pressure bomb, Plant Science, Leaf water potential, leaf water potential, Droughts, Plant Leaves, water stress, Pressure bombpressure chamber, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, plant water status, Plant water status, pressure chamber
Abstract

25 páginas.- 8 figuras.- 2 tablas.- 66 referencias.- Additional supporting information can be found online in the Supporting Information section at the end of this article., eaf water potential (psi(leaf)), typically measured using the pressure chamber, is the most important metric of plant water status, providing high theoretical value and information content for multiple applications in quantifying critical physiological processes including drought responses. Pressure chamber measurements of psi(leaf) (psi(leafPC)) are most typical, yet, the practical complexity of the technique and of the underlying theory has led to ambiguous understanding of the conditions to optimize measurements. Consequently, specific techniques and precautions diversified across the global research community, raising questions of reliability and repeatability. Here, we surveyed specific methods of psi(leafPC) from multiple laboratories, and synthesized experiments testing common assumptions and practices in psi(leafPC) for diverse species: (i) the need for equilibration of previously transpiring leaves; (ii) leaf storage before measurement; (iii) the equilibration of psi(leaf) for leaves on bagged branches of a range of dehydration; (iv) the equilibration of psi(leaf) across the lamina for bagged leaves, and the accuracy of measuring leaves with artificially 'elongated petioles'; (v) the need in psi(leaf) measurements for bagging leaves and high humidity within the chamber; (vi) the need to avoid liquid water on leaf surfaces; (vii) the use of 'pulse' pressurization versus gradual pressurization; and (viii) variation among experimenters in psi(leafPC) determination. Based on our findings we provide a best practice protocol to maximise accuracy, and provide recommendations for ongoing species-specific tests of important assumptions in future studies., European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 751918-AgroPHYS; Marie Curie Fellowship (FP7-PEOPLE-2013-IOF-624473); Austrian research agency (FWF) project P32203; National Science Foundation (Grant IOS-#1457279)

Published
2022

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