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First published online June 28, 2007; 10.1104/pp.107.102178

Plant Physiology 144:1878-1889 (2007)
© 2007 American Society of Plant Biologists

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PLANTS INTERACTING WITH OTHER ORGANISMS

Comparative Transcriptome Analysis Reveals Common and Specific Tags for Root Hair and Crack-Entry Invasion in Sesbania rostrata1,[W],[OA]

Ward Capoen2, Jeroen Den Herder, Stephane Rombauts, Jeroen De Gussem, Annick De Keyser, Marcelle Holsters* and Sofie Goormachtig

Department of Plant Systems Biology, Flanders Institute for Biotechnology and Department of Molecular Genetics, Ghent University, B–9052 Ghent, Belgium

The tropical legume Sesbania rostrata provides its microsymbiont Azorhizobium caulinodans with versatile invasion strategies to allow nodule formation in temporarily flooded habitats. In aerated soils, the bacteria enter via the root hair curling mechanism. Submergence prevents this epidermal invasion by accumulation of inhibiting concentrations of ethylene and, under these conditions, the bacterial colonization occurs via intercellular cortical infection at lateral root bases. The transcriptome of both invasion ways was compared by cDNA-amplified fragment length polymorphism analysis. Clusters of gene tags were identified that were specific for either epidermal or cortical invasion or were shared by both. The data provide insight into mechanisms that control infection and illustrate that entry via the epidermis adds a layer of complexity to rhizobial invasion.

1 This work was supported by the Research Foundation-Flanders (grants nos. G.0066.07 and G.0341.04 and predoctoral fellowship to J.D.H.) and the Institute for the Promotion of Innovation by Science and Technology in Flanders (predoctoral fellowship to W.C.).

2 Present address: Department of Disease and Stress Biology, John Innes Centre, Norwich NR4 7UH, UK.

The authors responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) are: Sofie Goormachtig (sofie.goormachtig{at}psb.ugent.be) and Marcelle Holsters (marcelle.holsters{at}psb.ugent.be).

[W] The online version of this article contains Web-only data.

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.107.102178

* Corresponding author; e-mail marcelle.holsters{at}psb.ugent.be; fax 32–9–3313809.

Received May 10, 2007; accepted June 25, 2007; published June 28, 2007.

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