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Published on July 13, 2007; 10.1104/pp.107.101691

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Received April 30, 2007
Accepted July 6, 2007

Phosphate Homeostasis and Root Development in Arabidopsis Is Synchronized by the Zinc Finger Transcription Factor ZAT6

Ballachanda N. Devaiah , Vinay K. Nagarajan , and Kashchandra G. Raghothama *

Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907-1165

* Corresponding author; email: kraghoth{at}purdue.edu.

Phosphorus availability is limited in many natural ecosystems. Plants adapt to phosphate (Pi) deficiency by complex molecular processes. There is growing evidence suggesting that transcription factors are key components in the regulation of these processes. In this study, we characterized the function of Zinc finger of Arabidopsis thaliana 6 (ZAT6), a Cys2/His2 zinc finger transcription factor that is responsive to Pi stress. ZAT6 is induced during Pi starvation and localizes to the nucleus. While the RNAi suppression of ZAT6 appeared to be lethal, its over-expression affects root development and retards seedling growth as a result of decreased Pi acquisition. The ZAT6 over-expression also resulted in altered root architecture of older plants, with consequent changes in Pi acquisition. These results indicate that ZAT6 regulates root development independent of the Pi status of the plant, thereby influencing Pi acquisition and homeostasis. In addition, the expression of several Pi starvation responsive genes was decreased in ZAT6 over-expressing plants, thereby confirming the role of ZAT6 in regulating Pi homeostasis. This study thus indicates that ZAT6 is a repressor of primary root growth and regulates Pi homeostasis through the control of root architecture. To our knowledge, ZAT6 is the first C2H2 zinc finger transcription factor reported to regulate root development and nutrient stress responses.




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C. Calderon-Vazquez, E. Ibarra-Laclette, J. Caballero-Perez, and L. Herrera-Estrella
Transcript profiling of Zea mays roots reveals gene responses to phosphate deficiency at the plant- and species-specific levels
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