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First published online October 21, 2005; 10.1105/tpc.105.035493

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The Plant Cell 17:3035-3050 (2005)
© 2005 American Society of Plant Biologists

Cell Cycle Progression in the Pericycle Is Not Sufficient for SOLITARY ROOT/IAA14-Mediated Lateral Root Initiation in Arabidopsis thaliana{boxw}

Steffen Vannestea, Bert De Rybela, Gerrit T.S. Beemstera, Karin Ljungb, Ive De Smeta, Gert Van Isterdaela, Mirande Naudtsa, Ryusuke Iidac, Wilhelm Gruissemd, Masao Tasakac, Dirk Inzéa, Hidehiro Fukakic and Tom Beeckmana,1

a Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology, Ghent University, B-9052 Ghent, Belgium
b Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
c Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma 630-0101, Nara, Japan
d Institute of Plant Sciences, Swiss Federal Institute of Technology and Zurich-Basel Plant Science Center, CH-8092 Zürich, Switzerland

1 To whom correspondence should be addressed. E-mail tom.beeckman{at}psb.ugent.be; fax 32-9-3313809.

To study the mechanisms behind auxin-induced cell division, lateral root initiation was used as a model system. By means of microarray analysis, genome-wide transcriptional changes were monitored during the early steps of lateral root initiation. Inclusion of the dominant auxin signaling mutant solitary root1 (slr1) identified genes involved in lateral root initiation that act downstream of the auxin/indole-3-acetic acid (AUX/IAA) signaling pathway. Interestingly, key components of the cell cycle machinery were strongly defective in slr1, suggesting a direct link between AUX/IAA signaling and core cell cycle regulation. However, induction of the cell cycle in the mutant background by overexpression of the D-type cyclin (CYCD3;1) was able to trigger complete rounds of cell division in the pericycle that did not result in lateral root formation. Therefore, lateral root initiation can only take place when cell cycle activation is accompanied by cell fate respecification of pericycle cells. The microarray data also yielded evidence for the existence of both negative and positive feedback mechanisms that regulate auxin homeostasis and signal transduction in the pericycle, thereby fine-tuning the process of lateral root initiation.




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