Population differentiation in the banana leaf spot pathogen Mycosphaerella musicola, examined at a global scale

Hayden H.L., Carlier Jean, Aitken Elizabeth A. B.. 2003. Population differentiation in the banana leaf spot pathogen Mycosphaerella musicola, examined at a global scale. Plant Pathology, 52 (6) : 713-719.

Résumé : Single-copy restriction fragment length polymorphism (RFLP) markers were used to determine the genetic structure of the global population of #Mycosphaerella musicola#, the cause of Sigatoka (yellow Sigatoka) disease of banana. The isolates of #M. musicola# examined were grouped into four geographic populations representing Africa, Latin America and the Caribbean, Australia and Indonesia. Moderate levels of genetic diversity were observed for most of the populations (H = 0.22-0.44). The greatest genetic diversity was found in the Indonesian population (H = 0.44). Genotypic diversity was close to 50% in all populations. Population differentiation tests showed that the geographic populations of Africa, Latin America and the Caribbean, Australia and Indonesia were genetically different populations. Using tests, very high levels of genetic differentiation were detected between all the population pairs (Fst > 0.40), with the exception of the Africa and Latin America -Caribbean population pair. These two populations differed by only 3% (Fst = 0.03), and were significantly different (P < 0.05) from all other population pairs. The high level of genetic diversity detected in Indonesia in comparison to the other populations provides some support for the theory that #M. musicola# originated in South-east Asia and that #M. musicola# populations in other regions were founded by isolates from the South-east Asian region. The results also suggest the migration of M. musicola between Africa and the Latin America-Caribbean region.

Mots-clés Agrovoc : Musa, Mycosphaerella musicola, génétique des populations, distribution des populations, résistance aux maladies, RFLP

Mots-clés géographiques Agrovoc : Afrique, Amérique latine, Caraïbes, Australie, Asie du Sud-Est, Indonésie

Mots-clés complémentaires : Cercosporiose jaune

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

• Hayden H.L., CRCTPP (AUS)
• Carlier Jean, CIRAD-AMIS-PROTECTION DES CULTURES (FRA) ORCID: 0000-0002-6967-1852
• Aitken Elizabeth A. B., CRCTPP (AUS)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/518760/)

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