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Journal of Experimental Botany 2007 58(14):3829-3840; doi:10.1093/jxb/erm253
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© The Author [2007]. 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

Review Articles

Cell growth and differentiation in Arabidopsis epidermal cells

Sonia Guimil and Christophe Dunand*

Laboratory of Plant Physiology, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland

* To whom correspondence should be addressed. E-mail: christophe.dunand{at}bota.unige.ch

Plant epidermal cells are morphologically diverse, differing in size, shape, and function. Their unique morphologies reflect the integral function each cell performs in the organ to which it belongs. Cell morphogenesis involves multiple cellular processes acting in concert to create specialized shapes. The Arabidopsis epidermis contains numerous cell types greatly differing in shape, size, and function. Work on three types of epidermal cells, namely trichomes, root hairs, and pavement cells, has made significant progress towards understanding how plant cells reach their final morphology. These three cell types have highly distinct morphologies and each has become a model cell for the study of morphological processes. A growing body of knowledge is creating a picture of how endoreduplication, cytoskeletal dynamics, vesicle transport, and small GTPase signalling, work in concert to create specialized shapes. Similar mechanisms that determine cell shape and polarity are shared between these cell types, while certain mechanisms remain specific to each.

Key words: Actin, Arabidopsis, auxin, endoreduplication, GTPase signalling, microtubules, morphogenesis, morphology, pavement cells, planar polarity, root hairs, trichomes, vesicle trafficking

Received 8 June 2007; Revised 30 August 2007 Accepted 17 September 2007


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