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Plant and Cell Physiology Advance Access first published online on April 17, 2006
This version published online on April 18, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj043
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received October 3, 2005
Accepted March 30, 2006

Short Communication

Expression Profiling of Auxin-Treated Arabidopsis Roots: Toward a Molecular Analysis of Lateral Root Emergence

Marta Laskowski 1 *, Steven Biller 2, Ken Stanley 1, Tymoteusz Kajstura 1, and Reeta Prusty 3

1 Biology Department, Oberlin College, Oberlin, OH 44074 USA
2 Department of Biological Sciences, Stanford University, Stanford, CA 94305 USA
3 Dept. of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester MA 01609 USA

* To whom correspondence should be addressed.
Marta Laskowski, E-mail: mlaskows{at}oberlin.edu


  Abstract

Treating Arabidopsis roots with exogenous auxin results in dramatic changes in cellular processes including de novo induction of lateral roots which later emerge through the overlying cells. Microarray experiments reveal approximately eighty genes that are substantially upregulated in the root over the first 12 hours following auxin treatment. We hypothesize that the observed increase in expression of pectate lyase family genes leads to degradation of the pectin-rich middle lamellae, allowing cells in the parent root to separate cleanly. Differences in the degree of pectin methylation in lateral and parent roots may explain why lateral roots are not degraded themselves.

Keywords: Arabidopsis thaliana; Auxin; Cell separation; Lateral root; Microarray; Pectate lyase.
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