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JXB Advance Access published online on November 29, 2005
Journal of Experimental Botany, doi:10.1093/jxb/erj037
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received June 28, 2005
Accepted October 27, 2005

FOCUS PAPER

Positional information and mobile transcriptional regulators determine cell pattern in the Arabidopsis root epidermis

Liam Dolan 1 *

1 Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK

* To whom correspondence should be addressed.
Liam Dolan, E-mail: liam.dolan{at}bbsrc.ac.uk


  Abstract

The root epidermis is a model system for deciphering the mechanism underpinning the formation of cellular pattern in planar groups of cells. The epidermis comprises rows of hair cells (H) and non-hair-bearing epidermal cells (N). Laser ablation and clonal analysis have shown that the fates of epidermal cells are flexible through development and that positional information which may be located in the cell wall or extracellular matrix determines cell fate. A leucine-rich repeat protein called SCRAMBLED is required for the development of cell pattern which may be involved in the perception of positional information. It is proposed that positional signals then initiate the cell-specific expression of a number of transcription factors that complete the patterning process, resulting in the expression of hair-promoting genes in hair cells (H) and their repression in the hairless cells (N).

Keywords: Arabidopsis; root epidermis; root hairs.
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