Root cap size and shape influence responses to the physical strength of the growth medium in Arabidopsis thaliana primary roots - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Experimental Botany Année : 2020

Root cap size and shape influence responses to the physical strength of the growth medium in Arabidopsis thaliana primary roots

Résumé

During the progression of root in soil, root cap cells are the first to encounter obstacles and are known to sense environmental cues, thus making the root cap a potential mechanosensing site. In this study, a two-layered growth medium system was developed in order to study root responses to variations in the physical strength of the medium and the importance of the root cap in the establishment of these responses. Root growth and trajectory of primary roots of Arabidopsis seedlings were investigated using in vivo image analysis. After contact with the harder layer of the medium, the root either penetrated it or underwent rapid curvature, thus enabling reorientation of growth. We initially hypothesized that the root-cap structure would affect apex penetration and reorientation, with pointed caps facilitating and domed caps impeding root penetration. This hypothesis was investigated by analysing the responses of Arabidopsis mutants with altered root caps. The primary root of lines of the fez-2 mutant, which has fewer root-cap cell layers and a more pointed root cap than wild-type roots, showed impaired penetration ability. Conversely, smb-3 roots, which display a rectangular-shaped cap, showed enhanced penetration abilities. These results, which contradict our original hypothesis, reveal a role for resistance to buckling in determining root penetration abilities. © The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology.
Fichier principal
Vignette du fichier
2019_Roue_J_Exp_Bot.pdf (1018.9 Ko) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-02394664 , version 1 (04-12-2019)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Juliette Roue, Hugo Chauvet-Thiry, Nicole Brunel-Michac, François Bizet, Bruno Moulia, et al.. Root cap size and shape influence responses to the physical strength of the growth medium in Arabidopsis thaliana primary roots. Journal of Experimental Botany, 2020, 71 (1), pp.126-137. ⟨10.1093/jxb/erz418⟩. ⟨hal-02394664⟩
368 Consultations
323 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More