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      The zinc-finger protein Zat12 plays a central role in reactive oxygen and abiotic stress signaling in Arabidopsis.

      Plant physiology

      Zinc Fingers, Transcriptional Activation, metabolism, genetics, Transcription Factors, Sodium Chloride, Signal Transduction, Reactive Oxygen Species, Promoter Regions, Genetic, Plants, Genetically Modified, Oxidative Stress, Osmotic Pressure, Oligonucleotide Array Sequence Analysis, Light, Hot Temperature, Genes, Reporter, Genes, Plant, Gene Expression Regulation, Plant, Gene Expression Profiling, Arabidopsis Proteins, growth & development, Arabidopsis

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          Abstract

          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 H(2)O(2) 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.

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          Author and article information

          Journal
          16183833
          1256000
          10.1104/pp.105.068254

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