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Pre-existing embolism causes reverse vulnerability segmentation in Populus.

Ian M Rimer, Anju Manandhar, Scott A M McAdam1

  • 1Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA.

Journal of Experimental Botany
|November 28, 2025
PubMed
Summary
This summary is machine-generated.

Reverse vulnerability segmentation in Populus species, where leaves are more resistant to embolism than stems, was observed only in older field-grown stems. This phenomenon is likely due to accumulated native embolism from environmental factors, not inherent xylem traits.

Keywords:
DroughtP50PLCmicroCTnative embolismsegmentationtreexylem

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Area of Science:

  • Plant Physiology
  • Xylem Hydraulics
  • Drought Resistance

Background:

  • Vulnerability segmentation in xylem protects against drought-induced embolism.
  • Classical segmentation: leaves more vulnerable than stems.
  • Reverse segmentation (leaves more resistant) has been suggested in Populus.

Purpose of the Study:

  • Investigate mechanisms of leaf-stem hydraulic segmentation in Populus species.
  • Determine conditions leading to reverse vulnerability segmentation.
  • Clarify if reverse segmentation is an adaptive trait.

Main Methods:

  • Optical vulnerability method to assess embolism resistance.
  • Comparison of field-grown and glasshouse-grown Populus species (P. trichocarpa, P. deltoides, P. grandidentata).
  • Micro-computed tomography and hydraulic conductivity measurements.

Main Results:

  • Reverse vulnerability segmentation occurred only in older, field-grown stems.
  • Field-grown older stems showed significant native embolism (>25% loss of conductivity).
  • No segmentation was observed in glasshouse-grown or newly formed stems.

Conclusions:

  • Reverse segmentation in Populus is not due to inherent xylem properties.
  • Accumulated native embolism, likely from freeze-thaw cycles or stem age, causes reverse segmentation.
  • Reverse segmentation in Populus appears to be an environmental byproduct, not a specific adaptation.