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JXB Advance Access originally published online on July 27, 2009
Journal of Experimental Botany 2009 60(13):3637-3643; doi:10.1093/jxb/erp232
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

REVIEW-ARTICLE

Lateral root emergence: a difficult birth

Benjamin Péret*, Antoine Larrieu and Malcolm J. Bennett

Plant Sciences Division and Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK

* To whom correspondence should be addressed. E-mail: benjamin.peret{at}nottingham.ac.uk

Lateral root initiation takes place deep within the parental root, requiring new primordia to break through the overlying tissues before they emerge into the soil. Lateral root emergence has been well described at the cellular level but, until recently, the molecular mechanisms involved were unclear. Scientists in the 19th and 20th centuries hypothesized that the cell wall of the overlying tissues was modified by enzymes released by cells within the primordium. Recent studies in the model plant Arabidopsis thaliana revealed the existence of a complex transcellular signalling network regulated by auxin that controls cell wall remodelling in cells overlying lateral root primordia. In the first part of this review, early observations on the cell biology of lateral root formation and emergence are summarized, and in the following two sections recent observations in Arabidopsis that led to the identification of the molecular mechanism regulating lateral root emergence are described.

Key words: Arabidopsis, auxin, cell separation, cell wall, lateral root emergence, rice

Received 22 May 2009; Revised 26 June 2009 Accepted 1 July 2009


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