Spatiotemporal asymmetric auxin distribution A means to coordinate plant development Review Article

Author(s): Tanaka, Hirokazu; Dhonukshe, Pankaj; Brewer, Philip B; Friml, Jiří
Title: Spatiotemporal asymmetric auxin distribution A means to coordinate plant development
Abstract: The plant hormone auxin plays crucial roles in regulating plant growth development, including embryo and root patterning, organ formation, vascular tissue differentiation and growth responses to environmental stimuli. Asymmetric auxin distribution patterns have been observed within tissues, and these so-called auxin gradients change dynamically during different developmental processes. Most auxin is synthesized in the shoot and distributed directionally throughout the plant. This polar auxin transport is mediated by auxin influx and efflux facilitators, whose subcellular polar localizations guide the direction of auxin flow. The polar localization of PIN auxin efflux carriers changes in response to developmental and external cues in order to channel auxin flow in a regulated manner for organized growth. Auxin itself modulates the expression and subcellular localization of PIN proteins, contributing to a complex pattern of feedback regulation. Here we review the available information mainly from studies of a model plant, Arabidopsis thaliana, on the generation of auxin gradients, the regulation of polar auxin transport and further downstream cellular events. © Birkhäuser Verlag, 2006.
Keywords: patterning; Arabidopsis; Auxin transport; Tropism; Indoleacetic acid; Polar protein targeting
Publication Title: Cellular and Molecular Life Sciences
Volume: 63
Issue 23
ISBN: 1420-9071
Publisher: Birkhäuser  
Date Published: 2006-11-01
Start Page: 2738
End Page: 2754
DOI: 10.1007/s00018-006-6116-5
Open access: no