JXB Advance Access published online on September 24, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh270
© 2004 by Oxford University Press
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1 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
* To whom correspondence should be addressed. 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.
Accepted August 10, 2004
Water Saving Agriculture Special Issue Article
Genes commonly regulated by water-deficit stress in Arabidopsis thaliana
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