The biological and evolutionary basis of systemic plant pathogenesis in Xanthomonas. Session 4. Oral 35

Jacobs Jonathan M., Pesce Céline, Vancheva Taca, Lang Jillian M., Pérez-Quintero Alvaro L., Allen Caitilyn, Leach Jan E., Gagnevin Lionel, Szurek Boris, Cunnac Sébastien, Bragard Claude, Koebnik Ralf. 2017. The biological and evolutionary basis of systemic plant pathogenesis in Xanthomonas. Session 4. Oral 35. In : Deepen Knowledge in Plant Pathology for Innovative Agro-Ecology. Book of Abstracts of the 12th European Fondation for Plant Pathology (EFPP) and the 10th French Society for Plant Pathology (SFP). EFPP, SFP. Dunkerque : EFPP-FSP, Résumé, 1 p. European Foundation for Plant Pathology Conference. 12, Dunkerque, France, 29 May 2017/2 June 2017.

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Additional Information : A l'occasion de ce congrès, s'est également déroulé la 10ème Conférence de la Société Française de Phytopathologie, du 29 mai au 2 juin 2017, Dunkerque, France

Abstract : Pathogenic microbes cause systemic and non-systemic diseases of plant and animal hosts. Systemic diseases are particularly destructive because the pathogen moves through the host vasculature causing widespread infection; meanwhile non-systemic pathogens remain restricted to the nonvascular tissue near the site of infection. The basis of systemic and non-systemic pathogenesis is unclear. Here we describe the role of cell wall degradation in the evolution and biology in the Gramnegative phytobacterial genus Xanthomonas. Xanthomonas comprises a diverse group of vascular and non-vascular pathogens of over 200 plant species. We demonstrate that a single, vascular pathogen-unique cell wall degrading enzyme called CelA contributes to systemic pathogenesis in multiple pathogenic lineages in this diverse genus. We determined that CelA1 was conserved only in systemic pathogenic bacteria in the genera Xanthomonas, Xylella and Ralstonia but absent in nonsystemic Gram-negative plant pathogenic bacteria. Most notably addition of this cell wall degrading enzyme to two distinct non-systemic pathogen species, barley-infecting Xanthomonas translucens and rice-infecting Xanthomonas oryzae, permitted systemic pathogenesis of their respective host plants. Further genomic analysis of non-systemic Xanthomonas pathogens appear to have inactivated this trait suggesting that they arose from related vascular subgroups upon adapting to the non-vascular plant environment. Overall this work provides a framework to describe pathogen emergence based on symptom development and tissue-specificity in an important pathogen genus. (Résumé d'auteur)

Classification Agris : H20 - Plant diseases

Auteurs et affiliations

  • Jacobs Jonathan M., IRD (FRA)
  • Pesce Céline, IRD (FRA)
  • Vancheva Taca, Sofia University (BGR)
  • Lang Jillian M., Colorado State University (USA)
  • Pérez-Quintero Alvaro L., IRD (FRA)
  • Allen Caitilyn, University of Wisconsin (USA)
  • Leach Jan E., Colorado State University (USA)
  • Gagnevin Lionel, CIRAD-BIOS-UMR IPME (FRA)
  • Szurek Boris, IRD (FRA)
  • Cunnac Sébastien, IRD (FRA)
  • Bragard Claude, UCL (BEL)
  • Koebnik Ralf, IRD (FRA)

Source : Cirad-Agritrop (

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