ASPB President's Symposium
Wenkel, Stephan , Emery, John , Barton, M. Kathryn .
The role of HD-ZIPIII / LITTLE ZIPPER interactions in the establishment of leaf polarity.
Leaves develop with a distinct top to bottom polarity that is critical for its function. The upper portion of the leaf is specialized, with its tightly packed palisade layer, for light capture while the lower portion, with its more loosely arranged mesophyll, is specialized for gas exchange. This polarity reflects an early polarization of the leaf primordium along its adaxial – abaxial axis. Members of the class III homeodomain leucine zipper transcription factor genes (HDZIPIII genes) promote adaxial development. HDZIPIII proteins possess a domain predicted to bind an unknown hydrophobic ligand. The role of such a ligand in HDZIPIII activity and in leaf development is a mystery. A model will be presented for the action of a newly identified family of LITTLE ZIPPER proteins in the control of HDZIPIII action. We propose that the negative feedback loop involving the LITTLE ZIPPER proteins serves as the ligand regulatable step in leaf development.
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1 - Carnegie Institution, Department of Plant Biology
2 - Carnegie Institution, Department of Plant Biology, Stanford, CA, 94305, USA
Presentation Type: ASPB Major Symposium
Location: International Ballroom North/Hilton
Date: Wednesday, July 11th, 2007
Time: 2:40 PM