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Xylem functioning, dysfunction and repair: a physical perspective and implications for phloem transport.

Wilfried Konrad1,2, Gabriel Katul3, Anita Roth-Nebelsick4

  • 1Department of Geosciences, University of Tübingen, Hoelderlinstrasse 12, Tübingen, Germany.

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|October 10, 2018
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Summary
This summary is machine-generated.

Plant xylem and phloem systems coordinate water and sugar transport. This review explores how xylem cavitation (bubble formation) impacts phloem function and sugar transport, linking plant hydraulics to overall health.

Keywords:
air seedingcavitationembryonic bubblesosmoregulationplant hydraulicssucrose transport

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Biophysics

Background:

  • Xylem and phloem are critical plant transport systems, traditionally studied separately.
  • Coordination between xylem and phloem remains an active area of research.
  • Understanding this interplay is vital for plant survival and function.

Purpose of the Study:

  • To review the coupling and coordination between plant xylem and phloem transport systems.
  • To analyze the impact of xylem cavitation on phloem pressure and sugar transport.
  • To link plant hydraulic function to phloem integrity and sugar transport efficiency.

Main Methods:

  • Analysis of balance equations governing fluid transport.
  • Modeling of air bubble formation and stability within the xylem.
  • Examination of chemical equilibrium between xylem and phloem systems.
  • Investigation of pressure dynamics in relation to soil moisture.

Main Results:

  • Xylem bubble formation (cavitation) significantly influences xylem pressure, affecting phloem pressure and sugar transport.
  • Helmholtz free energy principles explain embryonic bubble size and stability.
  • Xylem cavitation can lead to catastrophic phloem dysfunction.
  • A link exists between soil water availability and phloem functioning.

Conclusions:

  • The coordination between xylem and phloem is crucial for plant water and carbohydrate transport.
  • Xylem vulnerability to cavitation poses a significant risk to phloem function and sugar transport.
  • Future research should test the conjectured links between soil moisture dynamics and phloem maintenance.