Signaling in Polar Auxin Transport

AbstractPolar auxin transport, directionally delivering auxin and generating local auxin gradients, is pivotal to fundamental developmental processes in plants. The directional auxin flow is attributable to polar-localized auxin transporters. In particular, over the past several years, the cytological and molecular mechanisms of how auxin transporters distribute asymmetrically in the plasma membrane have become greatly understood. The cellular polarity players for auxin transporters include intracellular trafficking components, cargo phosphorylation cues and corresponding kinases, membrane lipid composition, ubiquitylation, and extracellular auxin receptor-mediated modulation of cytoskeleton. In addition to these internal polarity regulators, other major plant hormones, signaling molecules, environmental stimuli, and nutrients have been implicated in regulation of auxin transporters, reflecting the communication between diverse developmental/environmental signals and auxin-mediated plant development. In this chapter, we review the recent studies that have elucidated the regulatory mechanisms of auxin transport.KeywordsAuxin TransportLateral Root FormationPolar Auxin TransportPavement CellAuxin EffluxThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.