---
_id: '1852'
abstract:
- lang: eng
text: To control morphogenesis, molecular regulatory networks have to interfere
with the mechanical properties of the individual cells of developing organs and
tissues, but how this is achieved is not well known. We study this issue here
in the shoot meristem of higher plants, a group of undifferentiated cells where
complex changes in growth rates and directions lead to the continuous formation
of new organs [1, 2]. Here, we show that the plant hormone auxin plays an important
role in this process via a dual, local effect on the extracellular matrix, the
cell wall, which determines cell shape. Our study reveals that auxin not only
causes a limited reduction in wall stiffness but also directly interferes with
wall anisotropy via the regulation of cortical microtubule dynamics. We further
show that to induce growth isotropy and organ outgrowth, auxin somehow interferes
with the cortical microtubule-ordering activity of a network of proteins, including
AUXIN BINDING PROTEIN 1 and KATANIN 1. Numerical simulations further indicate
that the induced isotropy is sufficient to amplify the effects of the relatively
minor changes in wall stiffness to promote organogenesis and the establishment
of new growth axes in a robust manner.
acknowledgement: 'This work was funded by grants from EraSysBio+ (iSAM) and ERC (Morphodynamics). '
author:
- first_name: Massimiliano
full_name: Sassi, Massimiliano
last_name: Sassi
- first_name: Olivier
full_name: Ali, Olivier
last_name: Ali
- first_name: Frédéric
full_name: Boudon, Frédéric
last_name: Boudon
- first_name: Gladys
full_name: Cloarec, Gladys
last_name: Cloarec
- first_name: Ursula
full_name: Abad, Ursula
last_name: Abad
- first_name: Coralie
full_name: Cellier, Coralie
last_name: Cellier
- first_name: Xu
full_name: Chen, Xu
id: 4E5ADCAA-F248-11E8-B48F-1D18A9856A87
last_name: Chen
- first_name: Benjamin
full_name: Gilles, Benjamin
last_name: Gilles
- first_name: Pascale
full_name: Milani, Pascale
last_name: Milani
- first_name: Jirí
full_name: Friml, Jirí
id: 4159519E-F248-11E8-B48F-1D18A9856A87
last_name: Friml
orcid: 0000-0002-8302-7596
- first_name: Teva
full_name: Vernoux, Teva
last_name: Vernoux
- first_name: Christophe
full_name: Godin, Christophe
last_name: Godin
- first_name: Olivier
full_name: Hamant, Olivier
last_name: Hamant
- first_name: Jan
full_name: Traas, Jan
last_name: Traas
citation:
ama: Sassi M, Ali O, Boudon F, et al. An auxin-mediated shift toward growth isotropy
promotes organ formation at the shoot meristem in Arabidopsis. Current Biology.
2014;24(19):2335-2342. doi:10.1016/j.cub.2014.08.036
apa: Sassi, M., Ali, O., Boudon, F., Cloarec, G., Abad, U., Cellier, C., … Traas,
J. (2014). An auxin-mediated shift toward growth isotropy promotes organ formation
at the shoot meristem in Arabidopsis. Current Biology. Cell Press. https://doi.org/10.1016/j.cub.2014.08.036
chicago: Sassi, Massimiliano, Olivier Ali, Frédéric Boudon, Gladys Cloarec, Ursula
Abad, Coralie Cellier, Xu Chen, et al. “An Auxin-Mediated Shift toward Growth
Isotropy Promotes Organ Formation at the Shoot Meristem in Arabidopsis.” Current
Biology. Cell Press, 2014. https://doi.org/10.1016/j.cub.2014.08.036.
ieee: M. Sassi et al., “An auxin-mediated shift toward growth isotropy promotes
organ formation at the shoot meristem in Arabidopsis,” Current Biology,
vol. 24, no. 19. Cell Press, pp. 2335–2342, 2014.
ista: Sassi M, Ali O, Boudon F, Cloarec G, Abad U, Cellier C, Chen X, Gilles B,
Milani P, Friml J, Vernoux T, Godin C, Hamant O, Traas J. 2014. An auxin-mediated
shift toward growth isotropy promotes organ formation at the shoot meristem in
Arabidopsis. Current Biology. 24(19), 2335–2342.
mla: Sassi, Massimiliano, et al. “An Auxin-Mediated Shift toward Growth Isotropy
Promotes Organ Formation at the Shoot Meristem in Arabidopsis.” Current Biology,
vol. 24, no. 19, Cell Press, 2014, pp. 2335–42, doi:10.1016/j.cub.2014.08.036.
short: M. Sassi, O. Ali, F. Boudon, G. Cloarec, U. Abad, C. Cellier, X. Chen, B.
Gilles, P. Milani, J. Friml, T. Vernoux, C. Godin, O. Hamant, J. Traas, Current
Biology 24 (2014) 2335–2342.
date_created: 2018-12-11T11:54:22Z
date_published: 2014-10-06T00:00:00Z
date_updated: 2021-01-12T06:53:37Z
day: '06'
department:
- _id: JiFr
doi: 10.1016/j.cub.2014.08.036
intvolume: ' 24'
issue: '19'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://hal.archives-ouvertes.fr/hal-01074821
month: '10'
oa: 1
oa_version: Submitted Version
page: 2335 - 2342
publication: Current Biology
publication_status: published
publisher: Cell Press
publist_id: '5248'
quality_controlled: '1'
scopus_import: 1
status: public
title: An auxin-mediated shift toward growth isotropy promotes organ formation at
the shoot meristem in Arabidopsis
type: journal_article
user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87
volume: 24
year: '2014'
...