Auxin and other signals on the move in plants Review Article

Author(s): Robert, Hélène S; Friml, Jiří
Title: Auxin and other signals on the move in plants
Abstract: As multicellular organisms, plants, like animals, use endogenous signaling molecules to coordinate their own physiology and development. To compensate for the absence of a cardiovascular system, plants have evolved specialized transport pathways to distribute signals and nutrients. The main transport streams include the xylem flow of the nutrients from the root to the shoot and the phloem flow of materials from the photosynthetic active tissues. These long-distance transport processes are complemented by several intercellular transport mechanisms (apoplastic, symplastic and transcellular transport). A prominent example of transcellular flow is transport of the phytohormone auxin within tissues. The process is mediated by influx and efflux carriers, whose polar localization in the plasma membrane determines the directionality of the flow. This polar auxin transport generates auxin maxima and gradients within tissues that are instrumental in the diverse regulation of various plant developmental processes, including embryogenesis, organogenesis, vascular tissue formation and tropisms.
Keywords: Biological Transport; Signal Transduction; Indoleacetic Acids; Plant Physiological Phenomena; Photosynthesis
Publication Title: Nature Chemical Biology
Volume: 5
Issue 5
ISBN: 1552-4469
Publisher: Nature Publishing Group  
Date Published: 2009-05-01
Start Page: 325
End Page: 332
DOI: 10.1038/nchembio.170
Open access: no