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Title: Freeze/Thaw-Induced Embolism: Probability of Critical Bubble Formation Depends on Speed of Ice Formation

Journal Article · · Frontiers in Plant Science
 [1];  [1];  [2]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Australian National Univ., Canberra, ACT (Australia)

Bubble formation in the conduits of woody plants sets a challenge for uninterrupted water transportation from the soil up to the canopy. Freezing and thawing of stems has been shown to increase the number of air-filled (embolized) conduits, especially in trees with large conduit diameters. Despite numerous experimental studies, the mechanisms leading to bubble formation during freezing have not been addressed theoretically. We used classical nucleation theory and fluid mechanics to show which mechanisms are most likely to be responsible for bubble formation during freezing and what parameters determine the likelihood of the process. Our results confirm the common assumption that bubble formation during freezing is most likely due to gas segregation by ice. If xylem conduit walls are not permeable to the salts expelled by ice during the freezing process, osmotic pressures high enough for air seeding could be created. The build-up rate of segregated solutes in front of the ice-water interface depends equally on conduit diameter and freezing velocity. Therefore, bubble formation probability depends on these variables. The dependence of bubble formation probability on freezing velocity means that the experimental results obtained for cavitation threshold conduit diameters during freeze/thaw cycles depend on the experimental setup; namely sample size and cooling rate. The velocity dependence also suggests that to avoid bubble formation during freezing trees should have narrow conduits where freezing is likely to be fast (e.g., branches or outermost layer of the xylem). Avoidance of bubble formation during freezing could thus be one piece of the explanation why xylem conduit size of temperate and boreal zone trees varies quite systematically.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1396108
Report Number(s):
LA-UR-12-21317
Journal Information:
Frontiers in Plant Science, Vol. 3; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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Cited By (12)

Elevational adaptation of morphological and anatomical traits by Sakhalin fir (Abies sachalinensis) journal November 2019
Annual patterns of xylem embolism in high-yield apple cultivars journal January 2017
Short-time xylem tension relaxation prevents vessel refilling and alleviates cryo-fixation artifacts in diffuse-porous Carpinus tschonoskii and Cercidiphyllum japonicum journal June 2019
Variation of xylem vessel diameters across a climate gradient: insight from a reciprocal transplant experiment with a widespread boreal tree journal April 2015
Plant xylem hydraulics: What we understand, current research, and future challenges: Plant xylem hydraulics journal June 2017
Long-term stem CO 2 concentration measurements in Norway spruce in relation to biotic and abiotic factors journal January 2013
Moisture rivals temperature in limiting photosynthesis by trees establishing beyond their cold-edge range limit under ambient and warmed conditions journal April 2015
Die hard: timberline conifers survive annual winter embolism journal November 2019
Anatomical regulation of ice nucleation and cavitation helps trees to survive freezing and drought stress journal June 2013
The Widened Pipe Model of plant hydraulic evolution journal May 2021
Bursts of CO2 released during freezing offer a new perspective on avoidance of winter embolism in trees journal September 2014
Cavitation and water fluxes driven by ice water potential inJuglans regiaduring freeze–thaw cycles journal November 2015

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