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A Simple Protocol for Mapping the Plant Root System Architecture Traits
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Quantification of complex modular architecture in plants.

Catherine Reeb1, Jaap Kaandorp2, Fredrik Jansson2

  • 1Institut de Systématique, Évolution, Biodiversité (ISYEB - UMR7205 - Sorbonne Universités MNHN, CNRS, EPHE) Muséum national d'Histoire Naturelle, 57 rue Cuvier CP 50, 75005, Paris, France.

The New Phytologist
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PubMed
Summary

We developed MorphoSnake, a new method using graph theory to quantify plant shapes, aiding taxonomic and evolutionary studies. This tool measures complex plant structures, enabling new insights into plant evolution and identification.

Keywords:
integrative taxonomymodular architecturemorphogeometrysoftwarespecies delimitation analysis

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Area of Science:

  • Botany
  • Evolutionary Biology
  • Computational Biology

Background:

  • Morphometrics quantifies biological shapes for taxonomic, evolutionary, and functional studies.
  • Thalloid plants possess reduced morphologies and lack formal description frameworks, hindering taxonomic and evolutionary research.
  • Quantifying complex modular plant architectures is challenging due to their reduced and varied forms.

Purpose of the Study:

  • To introduce a novel morphometric method for quantifying complex modular plant architectures, specifically thalloid plants.
  • To develop a computational tool for objective and repeatable shape measurements in plants.
  • To facilitate taxonomic and evolutionary studies in challenging plant groups.

Main Methods:

  • Utilized graph theory to represent thalli as hierarchical series of nodes and edges.
  • Developed the MorphoSnake computer program to extract plant skeletons and contours.
  • Automated the acquisition of width, length, angle, and sinuosity measurements at various organizational levels.

Main Results:

  • Demonstrated the application of MorphoSnake to quantify leaf architecture in Hymenophyllum ferns.
  • Provided a case study of integrative taxonomy in the genus Riccardia using MorphoSnake.
  • Showcased the method's applicability to all ramified plants.

Conclusions:

  • MorphoSnake provides accurate, homologous, and repeatable measurements for complex plant structures.
  • The method overcomes previous limitations in describing and analyzing thalloid plant morphologies.
  • Enables large-scale quantitative trait acquisition, opening avenues for species identification and evolutionary plasticity studies.