New approaches to dissect leaf hydraulics reveal large gradients in living tissues of tomato leaves

© 2024 The Authors New Phytologist © 2024 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 242(2024), 2 vom: 19. März, Seite 453-465
1. Verfasser: Jain, Piyush (VerfasserIn)
Weitere Verfasser: Huber, Annika E, Rockwell, Fulton E, Sen, Sabyasachi, Holbrook, N Michele, Stroock, Abraham D
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article drought leaf water relations nanosensor outside‐xylem conductance tomato undersaturation water potential Water 059QF0KO0R
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520 |a The water status of the living tissue in leaves is critical in determining plant function and global exchange of water and CO2. Despite significant advances in the past two decades, persistent questions remain about the tissue-specific origins of leaf hydraulic properties and their dependence on water status. We use a fluorescent nanoparticle reporter that provides water potential in the mesophyll apoplast adjacent to the epidermis of intact leaves to complement existing methods based on the Scholander Pressure Chamber (SPC). Working in tomato leaves, this approach provides access to the hydraulic conductance of the whole leaf, xylem, and outside-xylem tissues. These measurements show that, as stem water potential decreases, the water potential in the mesophyll apoplast can drop below that assessed with the SPC and can fall significantly below the turgor loss point of the leaf. We find that this drop in potential, dominated by the large loss (10-fold) of hydraulic conductance of the outside-xylem tissue, is not however strong enough to significantly limit transpiration. These observations highlight the need to reassess models of water transfer through the outside-xylem tissues, the potential importance of this tissue in regulating transpiration, and the power of new approaches for probing leaf hydraulics 
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650 4 |a drought 
650 4 |a leaf water relations 
650 4 |a nanosensor 
650 4 |a outside‐xylem conductance 
650 4 |a tomato 
650 4 |a undersaturation 
650 4 |a water potential 
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700 1 |a Huber, Annika E  |e verfasserin  |4 aut 
700 1 |a Rockwell, Fulton E  |e verfasserin  |4 aut 
700 1 |a Sen, Sabyasachi  |e verfasserin  |4 aut 
700 1 |a Holbrook, N Michele  |e verfasserin  |4 aut 
700 1 |a Stroock, Abraham D  |e verfasserin  |4 aut 
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773 1 8 |g volume:242  |g year:2024  |g number:2  |g day:19  |g month:03  |g pages:453-465 
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