Cell Polarity Signaling in Arabidopsis

Cell polarization is intimately linked to plant development, growth and responses to the environment. Major advances have been made in our understanding of the signaling pathways mid networks that regulate Cell polarity, in plants owing to recent studies on several model systems e.g., tip growth in pollen tubes, cell morphogenesis in the leaf epidermis, epidermis, and polar localization of PINs. From these studies we have learned that plant cells use conserved mechanisms such as Rho family GTPases to integrate both plant-specific and conserved polarity Cues mid to coordinate the cytoskeketon dynamics/reorganisation and vesicular trafficking required for polarity establishment and maintenance. This review focuses upon signaling mechanisms for cell polarity formation in Arabidopsis, with an emphasis on Rho GTPase signaling in polarized cell growth and how these mechanisms compare with those for Cell polarity signaling in yeast and animal systems.