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Article

Diversity and Geographical Structure of Xanthomonas citri pv. citri on Citrus in the South West Indian Ocean Region

1
CIRAD, UMR PVBMT, F-97410 Saint Pierre, La Réunion, France
2
ANSES, Plant Health Laboratory, F-97410 St Pierre, La Réunion, France
3
UFR Sciences et Technologies, Université de la Réunion, UMR PVBMT, F-97490 St Denis, La Réunion, France
4
INRAPE, Moroni BP 289, Comoros
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FAREI, Le Réduit 80835, Mauritius
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National Biosecurity Agency, Victoria P.O Box 464, Mahé, Seychelles
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PHIM Plant Health Institute, CIRAD, INRAE, Institut Agro, IRD, University Montpellier, F-34398 Montpellier, France
*
Author to whom correspondence should be addressed.
Academic Editor: Jens Boch
Microorganisms 2021, 9(5), 945; https://doi.org/10.3390/microorganisms9050945
Received: 24 March 2021 / Revised: 16 April 2021 / Accepted: 26 April 2021 / Published: 27 April 2021
A thorough knowledge of genotypic and phenotypic variations (e.g., virulence, resistance to antimicrobial compounds) in bacteria causing plant disease outbreaks is key for optimizing disease surveillance and management. Using a comprehensive strain collection, tandem repeat-based genotyping techniques and pathogenicity assays, we characterized the diversity of X. citri pv. citri from the South West Indian Ocean (SWIO) region. Most strains belonged to the prevalent lineage 1 pathotype A that has a wide host range among rutaceous species. We report the first occurrence of genetically unrelated, nonepidemic lineage 4 pathotype A* (strains with a host range restricted to Mexican lime and related species) in Mauritius, Moheli and Réunion. Microsatellite data revealed that strains from the Seychelles were diverse, grouped in three different clusters not detected in the Comoros and the Mascarenes. Pathogenicity data suggested a higher aggressiveness of strains of one of these clusters on citron (Citrus medica). With the noticeable exception of the Comoros, there was no sign of recent interisland movement of the pathogen. Consistent with this finding, the copL gene, a marker for the plasmid-borne copLAB copper resistance that was recently identified in Réunion, was not detected in 568 strains from any islands in the SWIO region apart from Réunion. View Full-Text
Keywords: molecular epidemiology; citrus; Asiatic canker; copper resistance; aggressiveness molecular epidemiology; citrus; Asiatic canker; copper resistance; aggressiveness
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MDPI and ACS Style

Pruvost, O.; Richard, D.; Boyer, K.; Javegny, S.; Boyer, C.; Chiroleu, F.; Grygiel, P.; Parvedy, E.; Robène, I.; Maillot-Lebon, V.; Hamza, A.; Lobin, K.K.; Naiken, M.; Vernière, C. Diversity and Geographical Structure of Xanthomonas citri pv. citri on Citrus in the South West Indian Ocean Region. Microorganisms 2021, 9, 945. https://doi.org/10.3390/microorganisms9050945

AMA Style

Pruvost O, Richard D, Boyer K, Javegny S, Boyer C, Chiroleu F, Grygiel P, Parvedy E, Robène I, Maillot-Lebon V, Hamza A, Lobin KK, Naiken M, Vernière C. Diversity and Geographical Structure of Xanthomonas citri pv. citri on Citrus in the South West Indian Ocean Region. Microorganisms. 2021; 9(5):945. https://doi.org/10.3390/microorganisms9050945

Chicago/Turabian Style

Pruvost, Olivier, Damien Richard, Karine Boyer, Stéphanie Javegny, Claudine Boyer, Frédéric Chiroleu, Pierre Grygiel, Evelyne Parvedy, Isabelle Robène, Véronique Maillot-Lebon, Azali Hamza, Kanta K. Lobin, Marc Naiken, and Christian Vernière. 2021. "Diversity and Geographical Structure of Xanthomonas citri pv. citri on Citrus in the South West Indian Ocean Region" Microorganisms 9, no. 5: 945. https://doi.org/10.3390/microorganisms9050945

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