Root Circumnutation Reduces Mechanical Resistance to Soil Penetration.
X‐ray computed tomography
cavity expansion
plant movements
root analogues
soil biomechanics
soil structure
Journal
Plant, cell & environment
ISSN: 1365-3040
Titre abrégé: Plant Cell Environ
Pays: United States
ID NLM: 9309004
Informations de publication
Date de publication:
27 Oct 2024
27 Oct 2024
Historique:
revised:
04
09
2024
received:
07
05
2024
accepted:
01
10
2024
medline:
28
10
2024
pubmed:
28
10
2024
entrez:
28
10
2024
Statut:
aheadofprint
Résumé
Root circumnutation, the helical movement of growing root tips, is a widely observed behaviour of plants. However, our mechanistic understanding of the impacts of root circumnutation on root growth and soil exploration is limited. Here, we deployed a unique combination of penetrometer measurements, X-ray computed tomography and time-lapse imaging, and cavity expansion modelling to unveil the effects of root circumnutation on the mechanical resistance to soil penetration. To simulate differences in circumnutation amplitude and frequency occurring among plant species, genotypes and environmental conditions, we inserted cone penetrometers with varying bending stiffness into soil samples that were subjected to orbital movement at different velocities. We show that greater circumnutation intensity, determined by a greater circumnutation frequency in conjunction with a larger circumnutation amplitude, decreased the mechanical resistance to soil penetration. Cavity expansion theory and X-ray computed tomography provided evidence that increased circumnutation intensity reduces friction at the cone-soil interface, indicating a link between root circumnutation and the ability of plants to overcome mechanical constraints to root growth. We conclude that circumnutation is a key component of root foraging behaviour and propose that genotypic differences in circumnutation intensity can be leveraged to adapt crops to soils with greater mechanical resistance.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : This study was funded by the Swedish Research Council for Sustainable Development (Formas; grant number: 2019-01189 awarded to Tino Colombi and Thomas Keller), which is greatly acknowledged. Furthermore, Bipin K Pandey acknowledges funding from the Biotechnology and Biological Sciences Research Council (BBSRC Discovery Fellowship; grant number: BB/V00557X/1), and Tino Colombi acknowledges funding from the University of Nottingham (Nottingham Research Fellowship).
Informations de copyright
© 2024 The Author(s). Plant, Cell & Environment published by John Wiley & Sons Ltd.
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