Adhesion Mechanisms of Plant-Pathogenic Xanthomonadaceae

  • Nadia Mhedbi-Hajri
  • Marie-Agnès Jacques
  • Ralf KoebnikEmail author
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 715)


The family Xanthomonadaceae is a wide-spread family of bacteria belonging to the gamma subdivision of the Gram-negative proteobacteria, including the two plant-pathogenic genera Xanthomonas and Xylella, and the related genus Stenotrophomonas. Adhesion is a widely conserved virulence mechanism among Gram-negative bacteria, no matter whether they are human, animal or plant pathogens, since attachment to the host tissue is one of the key early steps of the bacterial infection process. Bacterial attachment to surfaces is mediated by surface structures that are anchored in the bacterial outer membrane and cover a broad group of fimbrial and non-fimbrial structures, commonly known as adhesins. In this chapter, we discuss recent findings on candidate adhesins of plant-pathogenic Xanthomonadaceae, including polysaccharidic (lipopolysaccharides, exopolysaccharides) and proteineous structures (chaperone/usher pili, type IV pili, autotransporters, two-partner-secreted and other outer membrane adhesins), their involvement in the formation of biofilms and their mode of regulation via quorum sensing. We then compare the arsenals of adhesins among different Xanthomonas strains and evaluate their mode of selection. Finally, we summarize the sparse knowledge on specific adhesin receptors in plants and the possible role of RGD motifs in binding to integrin-like plant molecules.


Xylem Vessel Diffusible Signal Factor Fimbrial Subunit Adhesin Gene Filamentous Hemagglutinin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We are grateful to Maurice Lesourd and Robert Filmon from the Service Commun d’Imagerie et d’Analyses Microscopiques, Faculté de Médecine, Université d’Angers, France, for help with scanning electron microscopy.


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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Nadia Mhedbi-Hajri
    • 1
  • Marie-Agnès Jacques
    • 1
  • Ralf Koebnik
    • 2
    Email author
  1. 1.Pathologie Végétale (UMR077 INRA–Agrocampus Ouest–Université d’Angers)BeaucouzéFrance
  2. 2.Laboratoire Génome et Développement des Plantes (UMR5096 Université de Perpignan–CNRS–IRD)MontpellierFrance

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