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TReSpire - a biophysical TRee Stem respiration model.

Roberto L Salomón1, Linus De Roo1, Jacek Oleksyn2

  • 1Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, Ghent, 9000, Belgium.

The New Phytologist
|September 9, 2019
PubMed
Summary
This summary is machine-generated.

A new model, TReSpire, improves understanding of plant stem respiration by coupling water and carbon fluxes. This breakthrough offers detailed insights into woody tissue physiology and CO2 dynamics.

Keywords:
CO2 effluxgrowth and maintenance respirationplant modellingsink demandstem carbon balancestem respirationturgor-driven growthxylem CO2 transport

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Area of Science:

  • Plant Physiology
  • Ecology
  • Biophysics

Background:

  • Mechanistic models for plant respiration, particularly in woody stems, are underdeveloped.
  • Stem CO2 efflux measurements may not accurately represent local respiratory activity.

Purpose of the Study:

  • To develop a process-based model (TReSpire) coupling water and carbon fluxes at the organ level for stem respiration.
  • To improve the understanding of stem growth dynamics, CO2 fluxes, and respiratory physiology.

Main Methods:

  • Coupled water and carbon flux modeling at the organ level (TReSpire).
  • Measurements included sap flow, stem diameter, water potential, temperature, CO2 efflux, and nonstructural carbohydrates in a maple tree.
  • Model validation involved monitoring xylem CO2 concentration and stem/xylem diameter variations in an ancillary tree.

Main Results:

  • TReSpire accurately models turgor pressure, maintenance respiration (Arrhenius kinetics, nitrogen content), and radial CO2 transport.
  • The model integrates CO2 diffusivity, solubility, and transport in sap.
  • Identified collinearity issues suggest further submodeling for phloem unloading and sugar-starch interconversion.

Conclusions:

  • TReSpire represents a significant advancement in modeling stem water and carbon fluxes at high temporal resolution.
  • The model, calibrated from a sink-driven perspective, can enhance understanding of plant physiological processes.
  • Potential to advance research across species and phenological stages.