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Título

Declining root water transport drives stomatal closure in olive undermoderate water stress

AutorRodríguez-Domínguez, Celia M. CSIC ORCID; Brodribb, Timothy J.
Palabras claveHydraulics
Olive
Rehydrationkinetics
Root hydraulic conductance
Shoothydraulic conductance
Soil–root interface
Water stress
Fecha de publicación1-ene-2020
EditorJohn Wiley & Sons
CitaciónNew Phytologist 225(1): 126-134 (2020)
ResumenEfficient water transport from soil to leaves sustains stomatal opening and steady-statephotosynthesis. The aboveground portion of this pathway is well-described, yet the roots andtheir connection with the soil are still poorly understood due to technical limitations. Here we used a novel rehydration technique to investigate changes in the hydraulic pathwaybetween roots and soil and within the plant body as individual olive plants were subjected to arange of water stresses. Whole root hydraulic resistance (including the radial pathway from xylem to the soil–rootinterface) constituted 81% of the whole-plant resistance in unstressed plants, increasing to>95% under a moderate level of water stress. The decline in this whole root hydraulicconductance occurred in parallel with stomatal closure and contributed significantly to thereduction in canopy conductance according to a hydraulic model. Our results demonstrate that losses in root hydraulic conductance, mainly due to a disconnectionfrom the soil during moderate water stress in olive plants, are profound and sufficient to inducestomatal closure before cavitation occurs. Future studies will determine whether this coreregulatory role of root hydraulics exists more generally among diverse plant species
Descripción9 páginas.-4 figuras.- 45 referencias.- Additional Supporting Information may be found online in theSupporting Information section at the end of the article http://dx.doi.org/10.1111/nph.16177
Versión del editorhttp://dx.doi.org/10.1111/nph.16177
URIhttp://hdl.handle.net/10261/191276
DOI10.1111/nph.16177
E-ISSN1469-8137
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