Journal Article

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

Katia Petroni, Giuseppina Falasca, Valentina Calvenzani, Domenico Allegra, Carmine Stolfi, Luana Fabrizi, Maria Maddalena Altamura and Chiara Tonelli

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 59, issue 6, pages 1201-1213
Published in print April 2008 | ISSN: 0022-0957
Published online March 2008 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jxb/ern027

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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.

Keywords: Arabidopsis; AtMYB11; growth rate; meristems; thin cell layers

Journal Article.  7211 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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