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Published on June 28, 2007; 10.1104/pp.107.102178

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Received May 10, 2007
Accepted June 25, 2007

Comparative Transcriptome Analysis Reveals Common and Specific Tags for Root Hair and Crack Entry Invasion in Sesbania rostrata

Ward Capoen , 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, Technologiepark 927, B-9052 Ghent, Belgium

* Corresponding author; email: marcelle.holsters{at}psb.ugent.be.

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.




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W. Capoen, J. Den Herder, J. Sun, C. Verplancke, A. De Keyser, R. De Rycke, S. Goormachtig, G. Oldroyd, and M. Holsters
Calcium Spiking Patterns and the Role of the Calcium/Calmodulin-Dependent Kinase CCaMK in Lateral Root Base Nodulation of Sesbania rostrata
PLANT CELL, May 1, 2009; 21(5): 1526 - 1540.
[Abstract] [Full Text] [PDF]


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