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Related Experiment Video

Updated: May 26, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Computational fluid dynamics models of conifer bordered pits show how pit structure affects flow.

Paul J Schulte1

  • 1School of Life Sciences, University of Nevada - Las Vegas, Las Vegas, NV 89154, USA.

The New Phytologist
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PubMed
Summary

Understanding water transport in trees requires studying xylem sap flow through conifer bordered pits. Models reveal torus and margo pores, not pit canals, significantly impede flow, with pore size and location being critical factors.

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Area of Science:

  • Plant physiology
  • Biophysics
  • Forestry

Background:

  • Xylem sap flow in conifers is crucial for water transport but poorly understood, especially through bordered pits.
  • Conifer bordered pits, with their torus and margo structure, are key hydraulic components influencing water movement.

Purpose of the Study:

  • To model fluid flow through conifer bordered pits to identify major resistance points.
  • To elucidate the role of pit membrane pores in regulating water transport in black spruce.

Main Methods:

  • Utilized computational fluid dynamics, solving the Navier-Stokes equations for fluid flow.
  • Incorporated detailed geometry of black spruce (Picea mariana) bordered pits and scanning electron microscopy data of margo pores.

Main Results:

  • Pit canals offer minimal resistance; torus and margo pores present significant resistance, varying with pit structure.
  • Flow through margo pores depends heavily on pore area and radial position relative to the torus.
  • A small percentage of margo pores, located centrally, account for nearly half of the total flow.

Conclusions:

  • The torus and margo pores are the primary regulators of xylem water transport resistance in conifers.
  • Pore size and location within the margo are critical determinants of hydraulic conductivity.
  • Outer margo regions may primarily serve mechanical support for the torus, rather than hydraulic function.