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JXB Advance Access published online on November 20, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp326
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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

Water-tolerant legume nodulation

Ward Capoen1, Sofie Goormachtig2,3 and Marcelle Holsters2,3,*

1Department of Disease and Stress Biology, John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK
2Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), Technologiepark 927, B-9052 Gent, Belgium
3Department of Plant Biotechnology and Genetics, Ghent University, Technologiepark 927, B-9052 Gent, Belgium

* To whom correspondence should be addressed: E-mail: marcelle.holsters{at}psb.ugent.be

Water-tolerant nodulation is an adaptation of legumes that grow in wet or temporarily flooded habitats. This nodulation mode takes place at lateral root bases via intercellular bacterial invasion in cortical infection pockets. The tropical legume Sesbania rostrata has become a model for the study of the molecular basis of crack entry nodulation compared with root hair curl nodulation. For intercellular invasion, Nodulation Factor (NF) signalling recruits an ethylene-dependent, common Sym gene-independent pathway, leading to local cell death. The NF structure requirements are less stringent than for intracellular invasion in root hairs, which is correlated with a very specific NF-induced calcium spiking signature, presumably necessary for correct gene expression to assemble a functional entry complex in the epidermis.

Key words: Calcium spiking, ethylene, intercellular invasion, root hair invasion, Sesbania rostrata

Received 7 September 2009; Revised 20 October 2009 Accepted 21 October 2009


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