Plant Physiology Preview
Published on March 26, 2004; 10.1104/pp.103.033431
Received September 16, 2003
Returned for revision December 20, 2003
Accepted January 2, 2004
When Defense Pathways Collide: The Response of Arabidopsis to a Combination of Drought and Heat Stress
Ludmila Rizhsky , Hongjian Liang , Joel Shuman , Vladimir Shulaev , Sholpan Davletova , and Ron Mittler *
Department of Biology, Technion, Israel Institute of Technology, Technion City, Haifa 32000, Israel (L.R.); Department of Botany, Plant Sciences Institute, Iowa State University, Ames, Iowa 50011 (H.L.); Virginia Bioinformatics Institute, Blacksburg, Virginia 24061 (J.S., V.S.); Department of Biochemistry, University of Nevada, Reno, Nevada 89557 (S.D., R.M.)
* Corresponding author; email: ronm{at}unr.edu.
Within their natural habitat, plants are subjected to a combination of abiotic conditions that include stresses such as drought and heat. Drought and heat stress have been extensively studied; however, little is known about how their combination impacts plants. The response of Arabidopsis plants to a combination of drought and heat stress was found to be distinct from that of plants subjected to drought or heat stress. Transcriptome analysis of Arabidopsis plants subjected to a combination of drought and heat stress revealed a new pattern of defense response in plants that includes a partial combination of two multigene defense pathways (i.e. drought and heat stress), as well as 454 transcripts that are specifically expressed in plants during a combination of drought and heat stress. Metabolic profiling of plants subjected to drought, heat stress, or a combination of drought and heat stress revealed that plants subject to a combination of drought and heat stress accumulated sucrose and other sugars such as maltose and gulose. In contrast, Pro that accumulated in plants subjected to drought did not accumulate in plants during a combination of drought and heat stress. Heat stress was found to ameliorate the toxicity of Pro to cells, suggesting that during a combination of drought and heat stress sucrose replaces Pro in plants as the major osmoprotectant. Our results highlight the plasticity of the plant genome and demonstrate its ability to respond to complex environmental conditions that occur in the field.
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