Geographic population structure of the honeybee microsporidian parasite Vairimorpha (Nosema) ceranae in the South West Indian Ocea

Blot Nicolas, Clémencet Johanna, Jourda Cyril, Lefeuvre Pierre, Warrit Natapot, Esnault Olivier, Delatte Hélène. 2023. Geographic population structure of the honeybee microsporidian parasite Vairimorpha (Nosema) ceranae in the South West Indian Ocea. Scientific Reports, 13:12122, 13 p.

Résumé : The microsporidian Vairimorpha (Nosema) ceranae is one of the most common parasites of the honeybee. A single honeybee carries many parasites and therefore multiple alleles of V. ceranae genes that seem to be ubiquitous. As a consequence, nucleotide diversity analyses have not allowed discriminating genetic structure of parasite populations. We performed deep loci-targeted sequencing to monitor the haplotype frequencies of genome markers in isolates from discontinuous territories, namely the tropical islands of the South West Indian Ocean. The haplotype frequency distribution corroborated the suspected tetraploidy of the parasite. Most major haplotypes were ubiquitous in the area but with variable frequency. While oceanic isolates differed from European and Asian outgroups, parasite populations from distinct archipelagoes also differed in their haplotype distribution. Interestingly an original and very divergent Malagasy isolate was detected. The observed population structure allowed formulating hypotheses upon the natural history of V. ceranae in this oceanic area. We also discussed the usefulness of allelic distribution assessment, using multiple informative loci or genome-wide analyses, when parasite population is not clonal within a single host.

Mots-clés Agrovoc : parasite, distribution des populations, distribution géographique, Vairimorpha, génétique des populations, Apis mellifera

Mots-clés géographiques Agrovoc : Madagascar, La Réunion, Maurice, Seychelles, Mayotte

Mots-clés géographiques complémentaires : Rodrigues

Mots-clés libres : Parasite evolution, Parasite genomics, Population genetics

Classification Agris : L72 - Organismes nuisibles des animaux

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission, European Regional Development Fund

Agences de financement hors UE : Conseil Régional de La Réunion, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Projets sur financement : (EU) EPIdémiosurveillance et BIOcontrôle dans le Sud-Ouest de l’Océan Indien

Auteurs et affiliations

• Blot Nicolas, CIRAD-BIOS-UMR PVBMT (REU) - auteur correspondant
• Clémencet Johanna, Université de la Réunion (REU)
• Jourda Cyril, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-7799-3501
• Lefeuvre Pierre, CIRAD-BIOS-UMR PVBMT (REU)
• Warrit Natapot, Chulalongkorn University (THA)
• Esnault Olivier, GDS Réunion (REU)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (MDG)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605731/)

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