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JXB Advance Access published online on March 7, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm020
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© 2007 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

A truncated MYB transcription factor from Antirrhinum majus regulates epidermal cell outgrowth

Felix W. Jaffé1 *, Alexander Tattersall2 and Beverley J. Glover1,{dagger}

1Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
2Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK

{dagger} To whom correspondence should be addressed. E-mail: bjg26{at}cam.ac.uk

Plant MYB genes can be divided into subgroups on the basis of additional conserved regions of sequence. In some cases, genes within a subgroup share similarities in function, as well as sequence. The functions of three proteins in subgroup 9 have been described, with AmMYBMX regulating the differentiation of conical-papillate petal epidermal cells, PhMYB1 involved in extending the growth of these cells, and AmMYBML1 involved in differentiation of several petal epidermal cell types. Here, the isolation of a gene encoding a new member of MYB subgroup 9, AmMYBML3 (Antirrhinum majus MYB MIXTA-LIKE 3) is described, which contains the defining regions of conserved sequence but is lacking the majority of the C-terminus, including the amphipathic {alpha}-helix presumed necessary for transcriptional activation. AmMYBML3 is expressed in all aerial organs, but its expression is restricted to outgrowing epidermal cells, including trichomes, stigmatic papillae, and petal conical-papillate cells. Ectopic expression of AmMYBML3 in tobacco results in the formation of conical-papillate cells in the usually flat carpel epidermis. These data suggest that this protein is capable of altering epidermal development, thus resulting in cellular outgrowth, despite the missing C-terminus, and may act in conjunction with other transcriptional activators to enhance cellular outgrowth from the epidermis of all aerial organs.

Key words: AmMYBML3, Antirrhinum, cellular differentiation, conical-papillate cell, development, epidermis, MYB, transcription factor, trichome

* Present address: CSIRO Plant Industry, Adelaide Laboratory, PO Box 350, Glen Osmond, SA 5064, Australia.

Received 19 September 2006; Revised 19 December 2006 Accepted 17 January 2007


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