Format

Send to

Choose Destination
Proc Natl Acad Sci U S A. 2019 Apr 3. pii: 201820882. doi: 10.1073/pnas.1820882116. [Epub ahead of print]

EXPANSIN A1-mediated radial swelling of pericycle cells positions anticlinal cell divisions during lateral root initiation.

Author information

1
School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom.
2
Centre for Plant Integrative Biology, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom.
3
Center for Organismal Studies, Heidelberg University, 69120 Heidelberg, Germany.
4
Nanoscale and Microscale Research Centre, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
5
Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium.
6
Center for Plant Systems Biology, VIB, B-9052 Ghent, Belgium.
7
VIB-UGent Center for Medical Biotechnology, B-9000 Ghent, Belgium.
8
Department of Biomolecular Medicine, Ghent University, B-9000 Ghent, Belgium.
9
Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark.
10
Center for Organismal Studies, Heidelberg University, 69120 Heidelberg, Germany; alexis.maizel@cos.uni-heidelberg.de ivsme@psb.vib-ugent.be.
11
School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom; alexis.maizel@cos.uni-heidelberg.de ivsme@psb.vib-ugent.be.

Abstract

In plants, postembryonic formation of new organs helps shape the adult organism. This requires the tight regulation of when and where a new organ is formed and a coordination of the underlying cell divisions. To build a root system, new lateral roots are continuously developing, and this process requires the tight coordination of asymmetric cell division in adjacent pericycle cells. We identified EXPANSIN A1 (EXPA1) as a cell wall modifying enzyme controlling the divisions marking lateral root initiation. Loss of EXPA1 leads to defects in the first asymmetric pericycle cell divisions and the radial swelling of the pericycle during auxin-driven lateral root formation. We conclude that a localized radial expansion of adjacent pericycle cells is required to position the asymmetric cell divisions and generate a core of small daughter cells, which is a prerequisite for lateral root organogenesis.

KEYWORDS:

Arabidopsis thaliana; EXPANSIN A1; cell wall remodeling; lateral root development; radial cell expansion

PMID:
30944225
DOI:
10.1073/pnas.1820882116
Free full text

Conflict of interest statement

The authors declare no conflict of interest.

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center