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Freeze dehydration vs supercooling in tree stems: physical and physiological modelling.

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Summary

Plant frost resistance relies on cellular dehydration or deep supercooling to prevent lethal freezing. A new multiphysics model simulates these processes, aiding in understanding plant survival strategies in cold climates.

Keywords:
freezing stressfrost hardinessmultiphysics modellingplant physicsstem diameterxylem pressure

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Area of Science:

  • Plant physiology
  • Biophysics
  • Numerical modeling

Background:

  • Frost resistance is critical for plant distribution at high latitudes and elevations.
  • Freeze-thaw cycles cause cellular damage and xylem embolism.
  • Plants employ dehydration and deep supercooling to prevent lethal intracellular freezing.

Purpose of the Study:

  • To develop and validate a multiphysics numerical model for simulating plant freezing responses.
  • To investigate the dynamics of cell dehydration, xylem pressure, and stem diameter changes during freezing and thawing.
  • To explore the influence of physiological and environmental factors on frost resistance mechanisms.

Main Methods:

  • Developed a multiphysics numerical model coupling water flow, heat transfer, and phase change.
  • Incorporated different plant cell types into the model.
  • Validated model results using experimental data on walnut tree stem diameter changes.

Main Results:

  • The model accurately simulated stem diameter changes during freezing and thawing.
  • Cell mechanical properties were found to have negligible impact under specific conditions.
  • Identified conditions where cell dehydration is sufficient for frost protection and where supercooling is essential.
  • Demonstrated the coupled effects of water/sugar content and air temperature on dehydration dynamics.

Conclusions:

  • The developed model provides insights into plant frost resistance mechanisms.
  • Cell dehydration and supercooling are crucial for preventing lethal intracellular freezing.
  • The model can be extended to study diverse plant species and anatomical structures.