Format

Send to

Choose Destination
Mol Syst Biol. 2018 Jan 10;14(1):e7687. doi: 10.15252/msb.20177687.

A Sizer model for cell differentiation in Arabidopsis thaliana root growth.

Author information

1
Department of Molecular Genetics, Center for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB Bellaterra (Cerdanyola del Vallès), Barcelona, Spain.
2
Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, Spain.
3
Department of Molecular Genetics, Center for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB Bellaterra (Cerdanyola del Vallès), Barcelona, Spain ana.cano@cragenomica.es mibanes@ub.edu.
4
Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, Spain ana.cano@cragenomica.es mibanes@ub.edu.
5
Universitat de Barcelona Institute of Complex Systems (UBICS) Universitat de Barcelona, Barcelona, Spain.

Abstract

Plant roots grow due to cell division in the meristem and subsequent cell elongation and differentiation, a tightly coordinated process that ensures growth and adaptation to the changing environment. How the newly formed cells decide to stop elongating becoming fully differentiated is not yet understood. To address this question, we established a novel approach that combines the quantitative phenotypic variability of wild-type Arabidopsis roots with computational data from mathematical models. Our analyses reveal that primary root growth is consistent with a Sizer mechanism, in which cells sense their length and stop elongating when reaching a threshold value. The local expression of brassinosteroid receptors only in the meristem is sufficient to set this value. Analysis of roots insensitive to BR signaling and of roots with gibberellin biosynthesis inhibited suggests distinct roles of these hormones on cell expansion termination. Overall, our study underscores the value of using computational modeling together with quantitative data to understand root growth.

KEYWORDS:

Arabidopsis root zonation; brassinosteroids; cell differentiation; computational analysis; phenotypic variability

PMID:
29321184
PMCID:
PMC5787709
DOI:
10.15252/msb.20177687
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for HighWire Icon for PubMed Central
Loading ...
Support Center