The DOF transcription factor Dof5.1 influences leaf axial patterning by promoting Revoluta transcription in Arabidopsis
Bressan, Ray Anthony
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Desert Agriculture Initiative
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AbstractDof proteins are transcription factors that have a conserved single zinc finger DNA-binding domain. In this study, we isolated an activation tagging mutant Dof5.1-D exhibiting an upward-curling leaf phenotype due to enhanced expression of the REV gene that is required for establishing adaxialabaxial polarity. Dof5.1-D plants also had reduced transcript levels for IAA6 and IAA19 genes, indicating an altered auxin biosynthesis in Dof5.1-D. An electrophoretic mobility shift assay using the Dof5.1 DNA-binding motif and the REV promoter region indicated that the DNA-binding domain of Dof5.1 binds to a TAAAGT motif located in the 5′-distal promoter region of the REV promoter. Further, transient and chromatin immunoprecipitation assays verified binding activity of the Dof5.1 DNA-binding motif with the REV promoter. Consistent with binding assays, constitutive over-expression of the Dof5.1 DNA-binding domain in wild-type plants caused a downward-curling phenotype, whereas crossing Dof5.1-D to a rev mutant reverted the upward-curling phenotype of the Dof5.1-D mutant leaf to the wild-type. These results suggest that the Dof5.1 protein directly binds to the REV promoter and thereby regulates adaxialabaxial polarity. © 2010 Blackwell Publishing Ltd.
SponsorsWe thank Gyung-Tae Kim for the rev-6 seeds and Yul-Ho Kim for the SEM pictures. S.-B. Choi and S.-Y. Kwon were supported by Bio-Green21 (grant 20080401034045 from the Rural Development Administration), and S.-B. Choi (CG2151) and S.-Y. Kwon (CG2120-1) were supported by the Crop Functional Genomics Center funded by the Ministry of Education, Science and Technology, Korea. S.-D. Yoo is supported by NRF (2010-0016898). R.A. Bressan and D.-J. Yun are supported by the WCU program (grant R32-10148).
JournalThe Plant Journal
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