Plant Physiology Preview
Published on June 24, 2005; 10.1104/pp.105.062174
Received March 4, 2005
Returned for revision April 8, 2005
Accepted April 21, 2005
The roothairless1 Gene of Maize Encodes a Homolog of sec3, Which Is Involved in Polar Exocytosis
Tsui-Jung Wen , Frank Hochholdinger , Michaela Sauer , Wesley Bruce , and Patrick S. Schnable *
Department of Agronomy, Iowa State University, Ames, Iowa 50011
Department of General Genetics, Center for Plant Molecular Biology, University of Tuebingen, 72076 Tuebingen, Germany
Pioneer Hi-Bred International, Johnston, Iowa 50131-1004
Department of Agronomy, Iowa State University, Ames, Iowa 50011; Center for Plant Genomics, Iowa State University, Ames, Iowa 50011
* Corresponding author; email: schnable{at}iastate.edu.
The roothairless1 (rth1) mutant is impaired in root hair elongation and exhibits other growth abnormalities. Unicellular root hairs elongate via localized tip growth, a process mediated by polar exocytosis of secretory vesicles. We report here the cloning of the rth1 gene that encodes a sec3 homolog. In yeast (Saccharomyces cerevisiae) and mammals, sec3 is a subunit of the exocyst complex, which tethers exocytotic vesicles prior to their fusion. The cloning of the rth1 gene associates the homologs of exocyst subunits to an exocytotic process in plant development and supports the hypothesis that exocyst-like proteins are involved in plant exocytosis. Proteomic analyses identified four proteins that accumulate to different levels in wild-type and rth1 primary roots. The preferential accumulation in the rth1 mutant proteome of a negative regulator of the cell cycle (a prohibitin) may at least partially explain the delayed development and flowering of the rth1 mutant.
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