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JXB Advance Access originally published online on June 20, 2005
Journal of Experimental Botany 2005 56(418):1983-1989; doi:10.1093/jxb/eri213
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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@oupjournals.org

REVIEW ARTICLE

Epidermal cell patterning and differentiation throughout the apical–basal axis of the seedling

Laura Serna*

Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Real Fábrica de Armas, Avda. Carlos III, s/n, E-45071 Toledo, Spain

* Fax: +34 925 268840. E-mail: laura.serna{at}uclm.es

The idea of common pathways guiding different fates is an emerging concept in plant development, and epidermal cell-fate specification in Arabidopsis thaliana is an excellent example to illustrate it. In the root epidermis, both hair patterning and differentiation depend on a complex interaction between both negative (WER, TTG, GL3, EGL3, and GL2) and positive (CPC, TRY, and ETC1) regulators of hair cell fate. These regulators pattern and differentiate hairs through a bi-directional signalling mechanism. The same molecular components (WER, TTG, GL3, EGL3, and GL2) seem to be involved in the patterning of stomata in the embryonic stem. However, the possible role of CPC, TRY, and ETC1 on stomatal patterning and/or differentiation has not been studied, questioning whether they, and the underlying bi-directional mechanism, guide patterning formation and differentiation in the hypocotyl.

Key words: Bi-directional signalling, differentiation, epidermis, hypocotyl, lateral inhibition, patterning, root hair, stoma, WER/TTG/GL3/EGL3/GL2 and CPC/TRY/ETC1 pathways


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[Abstract] [Full Text] [PDF]


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