Developmental and Structural Section
Eglit, Yana , Le, Jie , Sack, Fred D .
Analysis of GNOM function in Arabidopsis stomatal morphogenesis.
Stomatal valves regulate gas exchange for photosynthesis and transpiration. Pore dilation is controlled by a pair of kidney-shaped guard cells (GCs) in dicots. The stoma shows a bilateral symmetry both in the arrangement of GCs around the pore and in radial microtubule (MT) arrays in each GC. However, the genetic basis for GC morphogenesis is not well-understood. GNOM is a small ADP ribosylation factor GTPase (ARF-GEF) that regulates vesicle trafficking. We found that mutations in GNOM induce swollen GCs that are elongated perpendicular to the pore, although these stomata usually retain bilateral symmetry. We are currently studying the roles of MT organization, cell wall deposition, and vesicle trafficking to identify how GNOM acts in stomatal morphogenesis.
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1 - University of British Columbia, Botany, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 2:00 PM