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JXB Advance Access originally published online on August 23, 2007
Journal of Experimental Botany 2008 59(1):55-66; doi:10.1093/jxb/erm171
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© The Author [2007]. 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

SPECIAL ISSUE REVIEW PAPER

Auxin fluxes in the root apex co-regulate gravitropism and lateral root initiation

M. Lucas1,2, C. Godin2, C. Jay-Allemand3 and L. Laplaze1,*

1IRD, UMR DIA-PC (Agro.M/INRA/IRD/UM2), Equipe Rhizogenèse, 911 avenue Agropolis, F-34394 Montpellier cedex 5, France
2INRIA, UMR DAP (Agro.M/Cirad/INRIA/INRA/UMII), Virtual Plants, TA40/02, Cirad, Avenue Agropolis, F-34398 Montpellier cedex 5, France
3Université Montpellier II, UMR DIA-PC (Agro.M/INRA/IRD/UM2), Equipe Rhizogenèse, Laboratoire de Biochimie et Physiologie Végétale, case 024, F-34095 Montpellier cedex 5, France

* To whom correspondence should be addressed. E-mail: laplaze{at}mpl.ird.fr

Root architecture plays an important role in water and nutrient acquisition and in the ability of the plant to adapt to the soil. Lateral root development is the main determinant of the shape of the root system and is controlled by external factors such as nutrient concentration. Here it is shown that lateral root initiation and root gravitropism, two processes that are regulated by auxin, are co-regulated in Arabidopsis. A mathematical model was generated that can predict the effects of gravistimulations on lateral root initiation density and suggests that lateral root initiation is controlled by an inhibitory fields mechanism. Moreover, gene transactivation experiments suggest a mechanism involving a single auxin transport route for both responses. Finally, co-regulation may offer a selective advantage by optimizing soil exploration as supported by a simple quantitative analysis.

Key words: AUX1, auxin transport, AXR3, GAL4, pericycle, root meristem

Received 19 February 2007; Revised 28 June 2007 Accepted 2 July 2007


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