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First published online May 15, 2003; 10.1104/pp.103.021261 Plant Physiology 132:893-906 (2003) © 2003 American Society of Plant Biologists Gene Expression Phenotypes of Arabidopsis Associated with Sensitivity to Low Temperatures[w]Torrey Mesa Research Institute, Syngenta Research and Technology, 3115 Merryfield Row, San Diego, California 92121
Chilling is a common abiotic stress that leads to economic losses in agriculture. By comparing the transcriptome of Arabidopsis under normal (22°C) and chilling (13°C) conditions, we have surveyed the molecular responses of a chilling-resistant plant to acclimate to a moderate reduction in temperature. The mRNA accumulation of approximately 20% of the approximately 8,000 genes analyzed was affected by chilling. In particular, a highly significant number of genes involved in protein biosynthesis displayed an increase in transcript abundance. We have analyzed the molecular phenotypes of 12 chilling-sensitive mutants exposed to 13°C before any visible phenotype could be detected. The number and pattern of expression of chilling-responsive genes in the mutants were consistent with their final degree of chilling injury. The mRNA accumulation profiles for the chilling-lethal mutants chs1, chs2, and chs3 were highly similar and included extensive chilling-induced and mutant-specific alterations in gene expression. The expression pattern of the mutants upon chilling suggests that the normal function of the mutated loci prevents a damaging widespread effect of chilling on transcriptional regulation. In addition, we have identified 634 chilling-responsive genes with aberrant expression in all of the chilling-lethal mutants. This reference gene list, including genes related to lipid metabolism, chloroplast function, carbohydrate metabolism and free radical detoxification, represents a potential source for genes with a critical role in plant acclimation to suboptimal temperatures. The comparison of transcriptome profiles after transfer of Arabidopsis plants from 22°C to 13°C versus transfer to 4°C suggests that quantitative and temporal differences exist between these molecular responses.
Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.021261. [w] The online version of this article contains Web-only data. The supplemental material is available at http://www.plantphysiol.org. 1 These authors contributed equally to the paper 2 Present address: Department of Botany, University of Toronto, 25 Willcocks Street, Toronto, ON, Canada M5S 3B2. 3 Present address: Diversa Corporation, 4955 Directors Place, San Diego, CA 92121. 4 Present address: Syngenta Biotechnology Inc., 3054 Cornwallis Road, Research Triangle Park, NC 27709. * Corresponding author;e-mail tong.zhu{at}syngenta.com;fax 9195418585. Received January 3, 2003; returned for revision March 2, 2003; accepted March 25, 2003. This article has been cited by other articles:
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