A mechanohydraulic model supports a role for plasmodesmata in cotton fiber elongation - Archive ouverte HAL
Article Dans Une Revue PNAS Nexus Année : 2024

A mechanohydraulic model supports a role for plasmodesmata in cotton fiber elongation

Résumé

Plant cell growth depends on turgor pressure, the cell hydrodynamic pressure, which drives expansion of the extracellular matrix (the cell wall). Turgor pressure regulation depends on several physical, chemical, and biological factors, including vacuolar invertases, which modulate osmotic pressure of the cell, aquaporins, which determine the permeability of the plasma membrane to water, cell wall remodeling factors, which determine cell wall extensibility (inverse of effective viscosity), and plasmodesmata, which are membranelined channels that allow free movement of water and solutes between cytoplasms of neighboring cells, like gap junctions in animals. Plasmodesmata permeability varies during plant development and experimental studies have correlated changes in the permeability of plasmodesmal channels to turgor pressure variations. Here, we study the role of plasmodesmal permeability in cotton fiber growth, a type of cell that increases in length by at least three orders of magnitude in a few weeks. We incorporated plasmodesma-dependent movement of water and solutes into a classical model of plant cell expansion. We performed a sensitivity analysis to changes in values of model parameters and found that plasmodesmal permeability is among the most important factors for building up turgor pressure and expanding cotton fibers. Moreover, we found that nonmonotonic behaviors of turgor pressure that have been reported previously in cotton fibers cannot be recovered without accounting for dynamic changes of the parameters used in the model. Altogether, our results suggest an important role for plasmodesmal permeability in the regulation of turgor pressure.
Fichier principal
Vignette du fichier
Hernandez_2024.pdf (827.24 Ko) Télécharger le fichier
Hernandez_2024_Supplementary.pdf (2.54 Mo) Télécharger le fichier
Origine Publication financée par une institution
Licence
Licence

Dates et versions

hal-04681218 , version 1 (29-08-2024)

Licence

Identifiants

Citer

Valeria Hernández-Hernández, Olivier C Marchand, Annamaria Kiss, Arezki Boudaoud. A mechanohydraulic model supports a role for plasmodesmata in cotton fiber elongation. PNAS Nexus, 2024, 3, ⟨10.1093/pnasnexus/pgae256⟩. ⟨hal-04681218⟩
52 Consultations
12 Téléchargements

Altmetric

Partager

More