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Journal of Experimental Botany, Vol. 55, No. 394, pp. 89-97, January 1, 2004
© 2004 Oxford University Press

Regulation of Growth, Development and Whole Organism Physiology

Nodule-enhanced protease inhibitor gene: emerging patterns of gene expression in nodule development on Sesbania rostrata

Received 3 April 2003; Accepted 3 October 2003

Sam Lievens, Sofie Goormachtig* and Marcelle Holsters{ddagger}

Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University, Technologiepark 927, B-9052 Gent, Belgium

* Both authors contributed equally to this work.
{dagger} Present address: Department of Medical Protein Research, Flanders Interuniversity Institute for Biotechnology, Ghent University, Albert Baertsoenkaai 3, B-9000 Gent, Belgium.
{ddagger} To whom correspondence should be addressed. Fax: +32 9 3313809. E-mail: marcelle.holsters{at}psb.ugent.be
Abbreviations: EST, expressed sequence tag; PCR, polymerase chain reaction; RACE, 5' rapid amplification of cDNA ends; RT, reverse transcription; SrPI, Sesbania rostrata protease inhibitor.

A novel marker for the early stages of nodulation of Sesbania rostrata was found to encode a putative member of the Kunitz family of protease inhibitors (SrPI1). Its expression was enhanced during nodulation, and was not up-regulated by wounding or upon infection with wide host-range pathogens. In situ expression patterns resembled those previously described for functions that may be implicated in delimiting infected nodule tissues from the rest of the plant. Thus, SrPI1 may be a component of a multi-layered barrier that restrains the invading rhizobia.

Key words: Early nodulin, Kunitz family, protease inhibitors, Sesbania rostrata.


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