Experimental observations of root growth in a controlled photoelastic granular materialReport as inadecuate




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1 LMGC - Laboratoire de Mécanique et Génie Civil 2 PMMD - Physique et Mécanique des Milieux Divisés LMGC - Laboratoire de Mécanique et Génie Civil 3 IATE - Ingénierie des Agro-polymères et Technologies Émergentes 4 UMR AMAP - Botanique et Bioinformatique de l-Architecture des Plantes

Abstract : We present a novel root observation apparatus capable of measuring the mechanical evolution of both the root network and the surrounding granular medium. The apparatus consists of 11 parallel growth frames, two of them being shearable, where the roots grow inside a photo-elastic or glass granular medium sandwiched between two pieces of glass. An automated system waters the plant and image each frame periodically in white light and between crossed polarisers. This makes it possible to follow i the root tips and ii the grain displacements as well as iii their inner pressure. We show how a root networks evolve in a granular medium and how it can mechanically stabilize it. This constitutes a model experiment to move forward in the understanding of the complex interaction between root growth and surrounding soil mechanical evolution.





Author: Jonathan Barés - Serge Mora - Jean-Yves Delenne - Thierry Fourcaud -

Source: https://hal.archives-ouvertes.fr/



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