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Xylem embolism refilling and resilience against drought-induced mortality in woody plants: processes and trade-offs

Journal Article · · Ecological Research
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Weizmann Inst. of Science, Rehovot (Israel)
  2. Macquarie Univ., NSW (Australia)
  3. Univ. of Utah, Salt Lake City, UT (United States)
  4. Univ. of Innsbruck, Innsbruck (Austria)
  5. Univ. of New South Wales, Sydney, NSW (Australia)
  6. Univ. of New Mexico, Albuquerque, NM (United States)
  7. Karlsruhe Inst. of Technology (KIT), Inst. of Meteorology and Climate Research-Atmospheric Environmental Research, Garmisch-Partenkirchen (Germany)
  8. Harvard Univ., Cambridge, MA (United States)
  9. Swiss Federal Inst. for Forest, Snow and Landscape Research WSL, Birmensdorf (Switzerland)
  10. Univ. di Trieste, Trieste (Italy)
Understanding which species are able to recover from drought, under what conditions, and the mechanistic processes involved, will facilitate predictions of plant mortality in response to global change. In response to drought, some species die because of embolism-induced hydraulic failure, whilst others are able to avoid mortality and recover, following rehydration. Several tree species have evolved strategies to avoid embolism, whereas others tolerate high embolism rates but can recover their hydraulic functioning upon drought relief. Here, we focus on structures and processes that might allow some plants to recover from drought stress via embolism reversal. We provide insights into how embolism repair may have evolved, anatomical and physiological features that facilitate this process, and describe possible trade-offs and related costs. Recent controversies on methods used for estimating embolism formation/repair are also discussed, providing some methodological suggestions. Although controversial, embolism repair processes are apparently based on the activity of phloem and ray/axial parenchyma. The mechanism is energetically demanding, and the costs to plants include metabolism and transport of soluble sugars, water and inorganic ions. We propose that embolism repair should be considered as a possible component of a ‘hydraulic efficiency-safety’ spectrum. We also advance a framework for vegetation models, describing how vulnerability curves may change in hydrodynamic model formulations for plants that recover from embolism.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532338
Journal Information:
Ecological Research, Journal Name: Ecological Research Journal Issue: 5 Vol. 33; ISSN 0912-3814
Country of Publication:
United States
Language:
English

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Cited By (10)

Embolism recovery strategies and nocturnal water loss across species influenced by biogeographic origin journal April 2019
The conifer-curve: fast prediction of hydraulic conductivity loss and vulnerability to cavitation journal August 2019
A Matter of Life and Death: Alternative Stable States in Trees, From Xylem to Ecosystems journal November 2020
Environmental Factors Influence Plant Vascular System and Water Regulation journal March 2019
Assessing the Response of Ecosystem Water Use Efficiency to Drought During and after Drought Events across Central Asia journal January 2020
Less safety for more efficiency: water relations and hydraulics of the invasive tree Ailanthus altissima (Mill.) Swingle compared with native Fraxinus ornus L. journal July 2018
Anisohydric behavior linked to persistent hydraulic damage and delayed drought recovery across seven North American tree species journal February 2019
High‐resolution computed tomography reveals dynamics of desiccation and rehydration in fern petioles of a desiccation‐tolerant fern journal June 2019
Ray fractions and carbohydrate dynamics of tree species along a 2750 m elevation gradient indicate climate response, not spatial storage limitation journal January 2020
The Possible Role of Non-Structural Carbohydrates in the Regulation of Tree Hydraulics journal December 2019

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