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An Exocyst Complex Functions in Plant Cell Growth in Arabidopsis and Tobacco(W)
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Plant Cell
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May 1, 2008
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Copyright informationCopyright American Society of Plant Biologists May 2008. Provided by ProQuest LLC. (Hide copyright information)
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The exocyst, an octameric tethering complex and effector of Rho and Rab GTPases, facilitates polarized secretion in yeast and animals. Recent evidence implicates three plant homologs of exocyst subunits (SEC3, SEC8, and EXO70A1) in plant cell morphogenesis. Here, we provide genetic, cell biologic
al, and biochemical evidence that these and other predicted subunits function together in vivo in Arabidopsis thaliana. Double mutants in exocyst subunits (sec5 exo70A1 and sec8 exo70A1) show a synergistic defect in etiolated hypocotyl elongation. Mutants in exocyst subunits SEC5, SEC6, SEC8, and SEC15a show defective pollen germination and pollen tube growth phenotypes. Using antibodies directed ...
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