Automated characterization of the mature root system form by a double-quadrangle-shaped polygon

Borianne Philippe, Subsol Gérard, Audebert Alain. 2016. Automated characterization of the mature root system form by a double-quadrangle-shaped polygon. In : 2016 IEEE International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA). IEEE, FSPMA. Qingdao : IEEE, 6-15. ISBN 978-1-5090-1659-4 IEEE International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA 2016), Qingdao, Chine, 7 Novembre 2016/11 Novembre 2016.

Résumé : We describe in this paper a new global approach to characterize the geometry of the root system area from black-and-white silhouettes. We introduce a covering polygon composed of two superimposed quadrangles to evaluate geometry features or to classify the growth strategy of root systems: the convex hull of the root system is progressively reduced to a double-quadrangle-shaped polygon by iterative suppression of least significant vertices to only keep the major geometry features. The root system density is addressed by the analysis of the hole distribution. The root system porosity is estimated from the decomposition of background regions in circular elements. An automated repartition of circular elements by 2-means clustering is introduced for a best appreciation of macro- and micro-holes, respectively associated to the anchorage and nutrient recovery potentials. The global parameters of the root system are evaluated from the geometry and density properties of the double-quadrangle-shaped polygon. The experimental studies address the sensitivity of the double-quadrangle-shaped polygon, especially the evaluation of the geometrical stability of the polygon according to slight variations of the root system segmentation. Several experiments, performed using a representative set composed of 100 root system silhouettes of several species - arabidopsis, chick pea, palm tree, rice, sorghum, and wheat - at different stages of growth, underline the robustness of the shape parameters, especially the upper and lower penetration angles.

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement
U10 - Informatique, mathématiques et statistiques
U30 - Méthodes de recherche

Auteurs et affiliations

• Borianne Philippe, CIRAD-BIOS-UMR AMAP (FRA)
• Subsol Gérard, CNRS (FRA)
• Audebert Alain, CIRAD-BIOS-UMR AGAP (SEN) ORCID: 0000-0002-5822-7166

Source : Cirad-Agritrop (https://agritrop.cirad.fr/584215/)

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