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Journal of Endotoxin Research
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Invited review: Priming, induction and modulation of plant defence responses by bacterial lipopolysaccharides

Mari-Anne Newman

Department of Plant Biology, Faculty of Life Sciences, University of Copenhagen, Frederiksberg, Denmark, mari{at}life.ku.dk

J. Maxwell Dow

BIOMERIT Research Centre, Department of Microbiology, BioSciences Institute, National University of Ireland, Cork, Ireland, m.dow{at}ucc.ie

Antonio Molinaro

Dipartimento di Chimica Organica e Biochimica, Universita' di Napoli Federico , Complesso Universitario Monte Sant'Angelo, Napoli, Italy, molinaro{at}unina.it

Michelangelo Parrilli

Dipartimento di Chimica Organica e Biochimica, Universita' di Napoli Federico , Complesso Universitario Monte Sant'Angelo, Napoli, Italy

Bacterial lipopolysaccharides (LPSs) have multiple roles in plant—microbe interactions. LPS contributes to the low permeability of the outer membrane, which acts as a barrier to protect bacteria from plant-derived antimicrobial substances. Conversely, perception of LPS by plant cells can lead to the triggering of defence responses or to the priming of the plant to respond more rapidly and/or to a greater degree to subsequent pathogen challenge. LPS from symbiotic bacteria can have quite different effects on plants to those of pathogens. Some details are emerging of the structures within LPS that are responsible for induction of these different plant responses. The lipid A moiety is not solely responsible for all of the effects of LPS in plants; core oligosaccharide and O-antigen components can elicit specific responses. Here, we review the effects of LPS in induction of defence-related responses in plants, the structures within LPS responsible for eliciting these effects and discuss the possible nature of the (as yet unidentified) LPS receptors in plants.

Key Words: Pathogen-associated molecular pattern • plant defence induction • plant defence priming • lipopolysaccharide structure and plant recognition

Journal of Endotoxin Research, Vol. 13, No. 2, 69-84 (2007)
DOI: 10.1177/0968051907079399
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