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Genetic structure of Mycosphaerella fijiensis populations from Australia, Papua New Guinea and the Pacific Islands

Hayden H.L., Carlier Jean, Aitken E.A.B.. 2003. Genetic structure of Mycosphaerella fijiensis populations from Australia, Papua New Guinea and the Pacific Islands. Plant Pathology, 52 (6) : pp. 703-712.

Journal article ; Article de revue à facteur d'impact
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Abstract : Single-copy restriction fragment length polymorphism (RFLP) markers were used to determine the genetic structure of #Mycosphaerella fijiensis#, the cause of black leaf streak (black Sigatoka) disease of banana and plantain, in the Torres Strait, Papua New Guinea (PNG), and the Pacific Islands. A moderate level of genetic variation was observed in all populations with genotypic diversity values of 60-78% of the theoretical maximum, and gene diversity (H) values between 0.269 and 0.336. All populations were at gametic equilibrium, and with the high level of genotypic diversity observed this indicated that sexual reproduction has a major role in the genetic structure of the #M. fijiensis# populations examined. Population differentiation was tested on several hierarchical scales. No evidence of population differentiation was observed between sites on Mer Island. A moderate level of population differentiation was observed within the Torres Strait, between Badu and Met Islands (Fst = 0.097). On a regional scale, the greatest differentiation was found between the populations of the Torres Strait and the Pacific. Populations from these regions were more closely related to the PNG population than to each other, suggesting they were founded in separate events from the same population. (Résumé d'auteur)

Mots-clés Agrovoc : Musa (bananes), Musa (plantains), Mycosphaerella fijiensis, Génétique des populations, Variation génétique, RFLP, Génotype

Mots-clés géographiques Agrovoc : Australie, Papouasie-Nouvelle-Guinée, Îles du Pacifique

Mots-clés complémentaires : Cercosporiose noire

Classification Agris : H20 - Plant diseases

Auteurs et affiliations

  • Hayden H.L., CRCTPP (AUS)
  • Carlier Jean, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
  • Aitken E.A.B., CRCTPP (AUS)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/518761/)

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