spacer gif spacer gif spacer gif spacer gif ARCHIVE ANNOUNCEMENT! spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Mylona, P.
Right arrow Articles by Dolan, L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Mylona, P.
Right arrow Articles by Dolan, L.
Development 129, 4327-4334 (2002)
© 2002 The Company of Biologists Limited

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

Panagiota Mylona1,*,{dagger}, Paul Linstead1, Rob Martienssen2 and Liam Dolan1

1 Department of Cell and Developmental Biology, John Innes Centre, Colney, Norwich NR4 7UH, UK
2 Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA
* Present address: The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK

{dagger}Author for correspondence (e-mail: Panagiota.Mylona{at}bbsrc.ac.uk)

Accepted 20 June 2002

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 wild-type 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.

Key words: Root, Radial pattern, Epidermis, Root hair, schizoriza, Arabidopsis thaliana






© The Company of Biologists Ltd 2002