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Declining root water transport drives stomatal closure in olive under moderate water stress

Citation

Rodriguez Dominguez, CM and Brodribb, TJ, Declining root water transport drives stomatal closure in olive under moderate water stress, New Phytologist, 225, (1) pp. 126-134. ISSN 0028-646X (2020) [Refereed Article]

Copyright Statement

© 2019 The Authors.

DOI: doi:10.1111/nph.16177

Abstract

  • Efficient water transport from soil to leaves sustains stomatal opening and steady-state photosynthesis. The aboveground portion of this pathway is well-described, yet the roots and their 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 pathway between roots and soil and within the plant body as individual olive plants were subjected to a range of water stresses.
  • Whole root hydraulic resistance (including the radial pathway from xylem to the soil-root interface) 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 hydraulic conductance occurred in parallel with stomatal closure and contributed significantly to the reduction in canopy conductance according to a hydraulic model.
  • Our results demonstrate that losses in root hydraulic conductance, mainly due to a disconnection from the soil during moderate water stress in olive plants, are profound and sufficient to induce stomatal closure before cavitation occurs. Future studies will determine whether this core regulatory role of root hydraulics exists more generally among diverse plant species.

Item Details

Item Type:Refereed Article
Keywords:hydraulics, olive, rehydration kinetics, root hydraulic conductance, shoot hydraulic conductance, soil–root interface, water stress
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Rodriguez Dominguez, CM (Dr Celia Rodriguez Dominguez)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:152000
Year Published:2020
Web of Science® Times Cited:58
Deposited By:Plant Science
Deposited On:2022-08-09
Last Modified:2022-09-07
Downloads:0

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