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AOBPreview originally published online on July 20, 2005
Annals of Botany 2005 96(5):737-743; doi:10.1093/aob/mci227
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

BOTANICAL BRIEFING

Gravity Signal Transduction in Primary Roots

ROBYN M. PERRIN, LI-SEN YOUNG, U.M. NARAYANA MURTHY, BENJAMIN R. HARRISON, YAN WANG, JESSICA L. WILL and PATRICK H. MASSON*

Laboratory of Genetics, University of Wisconsin—Madison, 425-G Henry Mall, Madison, WI 53706, USA

* For correspondence. E-mail phmasson{at}wisc.edu

Received: 18 March 2005    Returned for revision: 14 April 2005    Accepted: 25 May 2005    Published electronically: 20 July 2005

• Aims The molecular mechanisms that correlate with gravity perception and signal transduction in the tip of angiosperm primary roots are discussed.

• Scope Gravity provides a cue for downward orientation of plant roots, allowing anchorage of the plant and uptake of the water and nutrients needed for growth and development. Root gravitropism involves a succession of physiological steps: gravity perception and signal transduction (mainly mediated by the columella cells of the root cap); signal transmission to the elongation zone; and curvature response. Interesting new insights into gravity perception and signal transduction within the root tip have accumulated recently by use of a wide range of experimental approaches in physiology, biochemistry, genetics, genomics, proteomics and cell biology. The data suggest a network of signal transduction pathways leading to a lateral redistribution of auxin across the root cap and a possible involvement of cytokinin in initial phases of gravicurvature.

• Conclusion These new discoveries illustrate the complexity of a highly redundant gravity-signalling process in roots, and help to elucidate the global mechanisms that govern auxin transport and morphogenetic regulation in roots.

Key words: Root gravitropism, gravity signal transduction, root cap, elongation zone, amyloplast, statolith, auxin transport, cytokinin


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