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Updated: Nov 28, 2025
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A Technical Perspective in Modern Tree-ring Research - How to Overcome Dendroecological and Wood Anatomical Challenges
Published on: March 5, 2015
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Modelling the spatial crosstalk between two biochemical signals explains wood formation dynamics and tree-ring
Félix P Hartmann1, Cyrille B K Rathgeber2, Éric Badel1
1Université Clermont Auvergne, INRAE, PIAF, Clermont-Ferrand, France.
Journal of Experimental Botany
|November 28, 2020
Summary
A new computational model suggests that a crosstalk between auxin and another biochemical signal regulates conifer wood formation. This interaction explains the characteristic tree-ring structure, a pattern previously unexplained by auxin alone.
Area of Science:
- Plant Biology
- Computational Biology
- Forest Science
Background:
- Conifer xylogenesis creates distinct tree rings with earlywood and latewood.
- Internal controls govern xylem cell dimensions and differentiation patterns annually.
- Previous models based solely on auxin failed to replicate tree-ring structure.
Purpose of the Study:
- To investigate the hypothesis of xylogenesis regulation by auxin-cytokinin crosstalk.
- To develop a computational model simulating conifer wood formation.
- To explain the stable, characteristic tree-ring structure in conifers.
Main Methods:
- Utilized computational morphodynamics to model wood formation.
- Simulated the interaction between auxin and a secondary biochemical signal.
- Analyzed the resulting xylem cell differentiation and growth patterns.
Main Results:
- The model successfully simulated the dynamics of wood formation in conifers.
- The auxin and secondary signal crosstalk accurately reproduced the characteristic tree-ring structure.
- Auxin was found to control cell enlargement, while the other signal regulated cell division and auxin transport.
Conclusions:
- A crosstalk between auxin and another signal is sufficient to explain conifer tree-ring formation.
- This model provides a mechanistic understanding of xylogenesis regulation.
- The findings offer insights into the internal controls governing tree growth and wood anatomy.
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