Bridgehead invasion of a monomorphic plant pathogenic bacterium: Xanthomonas citri pv. citri, an emerging citrus pathogen in Mali and Burkina Faso

Leduc Alice, Traoré Yaya Nadia, Boyer Karine, Magne Maxime, Grygiel Pierre, Juhasz C.C., Boyer Claudine, Guérin Fabien, Wonni Issa, Ouédraogo Léonard, Vernière Christian, Ravigné Virginie, Pruvost Olivier. 2015. Bridgehead invasion of a monomorphic plant pathogenic bacterium: Xanthomonas citri pv. citri, an emerging citrus pathogen in Mali and Burkina Faso. Environmental Microbiology, 17 (11) : pp. 4429-4442.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : MICROBIOLOGY

Abstract : Molecular epidemiology studies further our understanding of migrations of phytopathogenic bacteria, the major determining factor in their emergence. Asiatic citrus canker, caused by Xanthomonas citri pv. citri, was recently reported in Mali and Burkina Faso, a region remote from other contaminated areas. To identify the origin and pathways of these emergences, we used two sets of markers, minisatellites and microsatellites, for investigating different evolutionary scales. Minisatellite typing suggested the introduction of two groups of strains in Mali (DAPC 1 and DAPC 2), consistent with microsatellite typing. DAPC 2 was restricted to Bamako district, whereas DAPC 1 strains were found much more invasive. The latter strains formed a major clonal complex based on microsatellite data with the primary and secondary founders detected in commercial citrus nurseries and orchards. This suggests that human activities played a major role in the spread of DAPC 1 strains via the movement of contaminated propagative material, further supported by the frequent lack of differentiation between populations from geographically distant nurseries and orchards. Approximate Bayesian Computation analyses supported the hypothesis that strains from Burkina Faso resulted from a bridgehead invasion from Mali. Multi-locus variable number of tandem repeat analysis and Approximate Bayesian Computation are useful for understanding invasion routes and pathways of monomorphic bacterial pathogens. (Résumé d'auteur)

Mots-clés Agrovoc : Xanthomonas campestris citri, Citrus, Biologie moléculaire, Transmission des maladies, Provenance, Marqueur génétique, Microsatellite, Minisatellite, Multiplication des plantes, Étiologie, Génétique des populations, Épidémiologie

Mots-clés géographiques Agrovoc : Mali, Burkina Faso

Mots-clés complémentaires : Xanthomonas citri pv citri, Émergence

Classification Agris : H20 - Plant diseases
U30 - Research methods

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Traoré Yaya Nadia, IPR (MLI)
  • Boyer Karine, CIRAD-BIOS-UMR PVBMT (REU)
  • Magne Maxime
  • Grygiel Pierre, CIRAD-BIOS-UMR PVBMT (REU)
  • Juhasz C.C.
  • Boyer Claudine, CIRAD-BIOS-UMR PVBMT (REU)
  • Guérin Fabien, Université de la Réunion (REU)
  • Wonni Issa, Institut de l'Environnement et Recherches Agricoles (BFA)
  • Ouédraogo Léonard, Institut de l'Environnement et Recherches Agricoles (BFA)
  • Vernière Christian, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-2312-2073
  • Ravigné Virginie, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-4252-2574
  • Pruvost Olivier, CIRAD-BIOS-UMR PVBMT (REU)

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