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First published online September 23, 2005; 10.1104/pp.105.068254

Plant Physiology 139:847-856 (2005)
© 2005 American Society of Plant Biologists

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Right arrow Reactive Oxygen Species
ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

The Zinc-Finger Protein Zat12 Plays a Central Role in Reactive Oxygen and Abiotic Stress Signaling in Arabidopsis1,[w]

Sholpan Davletova2, Karen Schlauch, Jesse Coutu and Ron Mittler*

Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Nevada 89557 (S.D., J.C., R.M.); and Center for Biomedical Genomics and Informatics, George Mason University, Manassas, Virginia 20110 (K.S.)

Plant acclimation to environmental stress is controlled by a complex network of regulatory genes that compose distinct stress-response regulons. In contrast to many signaling and regulatory genes that are stress specific, the zinc-finger protein Zat12 responds to a large number of biotic and abiotic stresses. Zat12 is thought to be involved in cold and oxidative stress signaling in Arabidopsis (Arabidopsis thaliana); however, its mode of action and regulation are largely unknown. Using a fusion between the Zat12 promoter and the reporter gene luciferase, we demonstrate that Zat12 expression is activated at the transcriptional level during different abiotic stresses and in response to a wound-induced systemic signal. Using Zat12 gain- and loss-of-function lines, we assign a function for Zat12 during oxidative, osmotic, salinity, high light, and heat stresses. Transcriptional profiling of Zat12-overexpressing plants and wild-type plants subjected to H2O2 stress revealed that constitutive expression of Zat12 in Arabidopsis results in the enhanced expression of oxidative- and light stress-response transcripts. Under specific growth conditions, Zat12 may therefore regulate a collection of transcripts involved in the response of Arabidopsis to high light and oxidative stress. Our results suggest that Zat12 plays a central role in reactive oxygen and abiotic stress signaling in Arabidopsis.

1 This work was supported by the National Science Foundation (grant nos. NSF–0431327 and NSF–0420033).

2 Present address: Plant Biotechnology Center, Department of Horticulture and Crop Science, Department of Plant Cellular and Molecular Biology, The Ohio State University, 055 Rightmire Hall, 1060 Carmack Road, Columbus, OH 43210.

[w] The online version of this article contains Web-only data.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.068254.

* Corresponding author; e-mail ronm{at}unr.edu; fax 775–784–1650.

Received July 9, 2005; returned for revision August 11, 2005; accepted August 11, 2005.




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