JXB Advance Access originally published online on September 24, 2004
Journal of Experimental Botany 2004 55(407):2331-2341; doi:10.1093/jxb/erh270
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RESEARCH PAPER |
Genes commonly regulated by water-deficit stress in Arabidopsis thaliana
Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA
Department of Molecular Genetics and Cell Biology, Erman Biology Center 304, University of Chicago, 1103 E. 57th Street, Chicago, IL 60637, USA
* Postal address, Chicago. Fax: +1 773 702 6648. E-mail: elizabeth.bray{at}ucr.edu
Cellular water-deficit stress triggers many changes in gene expression which can be used to define the response of a plant to an environmental condition. Microarray technology permits the study of expression patterns of thousands of genes simultaneously, permitting a comprehensive understanding of the types and quantities of RNAs that are present in a cell in response to water-deficit stress. The expression of specific genes was compared in three different experiments designed to understand changes in gene expression in response to water-deficit stress. Surprisingly, there was a relatively small set of genes that were commonly induced or repressed. There were 27 genes commonly induced and three commonly repressed; 1.4% and 0.2% of the genes analysed in common to all three experiments. The induced genes fell into six different functional categories: metabolism, transport, signalling, transcription, hydrophilic proteins, and unknown. The three commonly repressed genes indicated that repression of gene expression supported a frequently observed response to water-deficit stress, decreased growth. A more detailed analysis of genes involved in cell wall metabolism, indicated that there was a global decrease in expression of genes that promote cell expansion.
Key words: Arabidopsis, gene expression, microarray, water-deficit stress
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