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JXB Advance Access originally published online on March 20, 2008
Journal of Experimental Botany 2008 59(6):1201-1213; doi:10.1093/jxb/ern027
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© 2008 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

The AtMYB11 gene from Arabidopsis is expressed in meristematic cells and modulates growth in planta and organogenesis in vitro

Katia Petroni1, Giuseppina Falasca2, Valentina Calvenzani1, Domenico Allegra1, Carmine Stolfi2, Luana Fabrizi2, Maria Maddalena Altamura2 and Chiara Tonelli1,*

1Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Via Celoria 26, I-20133 Milano, Italy
2Dipartimento di Biologia Vegetale, Università La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy

* To whom correspondence should be addressed. E-mail: chiara.tonelli{at}unimi.it

In plants, MYB transcription factors play important roles in many developmental processes including cell cycle progression, cell differentiation, and lateral organ polarity. It is shown here that the R2R3-MYB AtMYB11 gene is expressed in root and shoot meristems and also in young still meristematic leaf and flower primordia of Arabidopsis. Knock-out atmyb11-I mutants and RNAi plants germinate faster, show a faster hypocotyl and primary root elongation, develop more lateral and adventitious roots, show faster development of the inflorescence, and initiate more lateral inflorescences and fruits than wild-type plants. The opposite phenotype was displayed by plants overexpressing AtMYB11. De novo formation of root meristemoids and, consequently, macroscopic roots, from thin cell layers cultured in vitro was enhanced in explants from atmyb11-I and reduced in those from lines overexpressing AtMYB11. These findings indicate that AtMYB11 modulates overall growth in plants by reducing the proliferation activity of meristematic cells and delaying plant development.

Key words: Arabidopsis, AtMYB11, growth rate, meristems, thin cell layers

Received 8 August 2007; Revised 18 January 2008 Accepted 21 January 2008


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