SCHIZORIZA controls an asymmetric cell division and restricts epidermal identity in the Arabidopsis root

Mylona, P., Linstead, P., Martienssen, R., Dolan, L. (September 2002) SCHIZORIZA controls an asymmetric cell division and restricts epidermal identity in the Arabidopsis root. Development, 129 (18). pp. 4327-4334. ISSN 0950-1991

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URL: http://www.ncbi.nlm.nih.gov/pubmed/12183384

Abstract

The primary root of Arabidopsis has a simple cellular organisation. The fixed radial cell pattern results from stereotypical cell divisions that occur in the meristem. Here we describe the characterisation of schizoriza (scz), a mutant with defective radial patterning. In scz mutants, the subepidermal layer (ground tissue) develops root hairs. Root hairs normally only form on epidermal cells of wildtype plants. Moreover, extra periclinal divisions (new wall parallel to surface of the root) occur in the scz root resulting in the formation of supernumerary layers in the ground tissue. Both scarecrow (scr) and short root (shr) suppress the extra periclinal divisions characteristic of scz mutant roots. This results in the formation of a single layered ground tissue in the double mutants. Cells of this layer develop root hairs, indicating that mis-specification of the ground tissue in scz mutants is uncoupled to the cell division defect. This suggests that during the development of the ground tissue SCZ has two distinct roles: (1) it acts as a suppressor of epidermal fate in the ground tissue, and (2) it is required to repress periclinal divisions in the meristem. It may act in the same pathway as SCR and SHR.

Item Type: Paper
Uncontrolled Keywords: root radial pattern epidermis root hair schizoriza Arabidopsis thaliana radial organization gene differentiation triptychon thaliana fate
Subjects: organism description > plant > Arabidopsis
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
bioinformatics > genomics and proteomics > genetics & nucleic acid processing
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > genes, structure and function
organism description > plant
CSHL Authors:
Communities: CSHL labs > Martienssen lab
Depositing User: Matt Covey
Date: September 2002
Date Deposited: 12 Dec 2013 20:17
Last Modified: 12 Dec 2013 20:17
Related URLs:
URI: http://repository.cshl.edu/id/eprint/28996

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