Structure of African populations of Pyricularia oryzae from rice

Odjo Théophile, Diagne Diariatou, Adreit Henri, Milazzo Joëlle, Raveloson Harinjaka, Andriantsimialona Dodelys, Kassankogno Abalo Itolou, Ravel Sébastien, Dieudonné Gumedzoé Yawovi Mawuéna, Ouedraogo Ibrahima, Koita Ousmane, Silué Drissa, Tharreau Didier. 2021. Structure of African populations of Pyricularia oryzae from rice. Phytopathology, 111 (8) : 1428-1437.

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Rice blast, caused by the filamentous ascomycete Pyricularia oryzae, is one of the most devastating diseases of rice. Four genetic clusters were previously identified, and three have a large geographic distribution. Asia is the center of diversity and the origin of most migrations to other continents, and sexual reproduction persisted only in the South China–Laos–North Thailand region, which was identified as the putative center of origin of all P. oryzae populations on rice. Despite the importance of rice blast disease, little is known about the diversity and the population structure of the pathogen in Africa (including Madagascar). The present study was intended to describe the structure of African populations of P. oryzae and identify the relationship between African and worldwide genetic clusters. A set of 2,057 strains (937 African and 1,120 Madagascan strains) were genotyped with 12 simple sequence repeat markers to assess the diversity and the population structure of P. oryzae. Four genetic clusters were identified in Africa and Madagascar. All four clusters previously identified are present in Africa. Populations from West Africa, East Africa, and Madagascar are highly differentiated. The geographic structure is consistent with limited dispersion and with some migration events between neighboring countries. The two mating types are present in Africa with a dominance of Mat1.2, but no female-fertile strain was detected, supporting the absence of sexual reproduction on this continent. This study showed an unsuspected high level of genetic diversity of P. oryzae in Africa and suggested several independent introductions.

Mots-clés Agrovoc : Pyricularia oryzae, variation génétique, structure de la population

Mots-clés géographiques Agrovoc : Bénin, Burkina Faso, Ghana, Côte d'Ivoire, Mali, Niger, Nigéria, Sénégal, Togo, Burundi, Cameroun, Kenya, Mozambique, République-Unie de Tanzanie, Ouganda, Madagascar, Afrique

Mots-clés libres : Ecology and epidemiology, Mycology, Population biology

Classification Agris : H20 - Maladies des plantes

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

Auteurs et affiliations

• Odjo Théophile, UAC (BEN)
• Diagne Diariatou, CIRAD-BIOS-UMR PHIM (FRA)
• Adreit Henri, CIRAD-BIOS-UMR PHIM (FRA)
• Milazzo Joëlle, CIRAD-BIOS-UMR BGPI (FRA)
• Raveloson Harinjaka, FOFIFA (MDG)
• Andriantsimialona Dodelys, FOFIFA (MDG)
• Kassankogno Abalo Itolou, INERA (BFA)
• Ravel Sébastien, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-6663-782X
• Dieudonné Gumedzoé Yawovi Mawuéna, Université de Lomé (TGO)
• Ouedraogo Ibrahima, INERA (BFA)
• Koita Ousmane, Université de Bamako (MLI)
• Silué Drissa, AfricaRice (BEN)
• Tharreau Didier, CIRAD-BIOS-UMR PHIM (FRA) ORCID: 0000-0003-3961-6120 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599280/)

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