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Membrane-trafficking pathways involved in the spatial and temporal control of cell wall deposition play a critical role during growth and development in plants. In eukaryotic organisms, Rab GTPases regulate membrane trafficking events associated with distinct compartments. Preuss et al. (pages 1589-1603) examine the function of the Arabidopsis Rab GTPase RabA4b during polarized expansion of developing root hair cells. As shown on the cover, expression of RabA4b fused to yellow fluorescent protein (RabA4b-YPF) in Arabidopsis localizes to the tips of growing root hair cells. Preuss et al. show that RabA4b-YFP expression is associated with active cell expansion in root hair cells. The authors propose that RabA4b regulates membrane trafficking through a compartment involved in the polarized secretion of cell wall components.
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Copyright © 2007 by the American Society of Plant Biologists
