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Plant and Cell Physiology Advance Access published online on May 13, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp069
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Arabidopsis Mutants carrying Chimeric Sigma Factor Genes reveal Regulatory Determinants for Plastid Gene Expression

Jennifer Schweer1, Simon Geimer2, Jörg Meurer2 and Gerhard Link1,*

1 Plant Cell Physiology, University of Bochum, D-44780 Bochum, Germany
2Botany Department, Biocenter, Ludwig-Maximilians-University Munich, D-82152 Planegg-Martinsried, Germany

*Corresponding author: Prof. Gerhard Link, Plant Cell Physiology, ND2-72, University of Bochum, Universitaetsstr. 150, D-44780 Bochum, Germany, Phone: +49 234 322 5495, Fax: +49 234 321 4188, E-mail: gerhard.link{at}ruhr-uni-bochum.de


  Abstract

Like bacteria, plastids contain sigma factors for promoter binding and transcription initiation. Accumulating evidence suggests that members of the plant sigma factor family can have specialized non-redundant roles in terms of promoter preference in various developmental and environmental situations. To specify regulatory determinants, we have chosen pairwise exchange of portions of Arabidopsis sigma coding regions, followed by transformation of the chimeric constructs into a sigma 6 knockout line. The resulting phenotypes and plastid RNA patterns point to an important though not exclusive role of the highly variable amino-terminal portion of plant sigma proteins.

Keywords: Arabidopsis - Chloroplast transcription - Chimeric sigma factors - Domain swap experiments - Regulatory determinants

(Received March 6, 2009; Accepted May 10, 2009)
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