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Populations study of Mycosphaerella fijiensis and genetic improvement of bananas for resistance to black leaf streak disease

Carlier Jean, El Hadrami Abdelbasset, Hayden H., Zapater Marie-Françoise, Lapeyre Fabienne. 1999. Populations study of Mycosphaerella fijiensis and genetic improvement of bananas for resistance to black leaf streak disease. In : The International symposium on the molecular and cellular biology of banana. Boyce Thompson Institute for Plant Research. New York : Boyce Thompson Institute for Plant Research, 40. International Symposium on the Molecular and Cellular Biology of Banana, Ithaca, États-Unis, 22 Mars 1999/25 Mars 1999.

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Autre titre : Etude des populations de Mycosphaerella fijiensis et amélioration génétique des bananiers pour la résistance à la maladie des raies noires

Résumé : Knowledge of the extent and distribution of variability within #M. fijiensis# is necessary for efficient genetic improvement of banana for a durable resistance to black leaf steak disease. The population genetic structure of #M. fijiensis# has been studied at a global, country and field scale using molecular markers. These studies have shown that populations of #M. fijiensis# can maintain a high level of genetic diversity at a small scale, and that recombination plays an important role in this pathogen. The Australasia Southeast Asia region is the centre of #M. fijiensis# diversity. The founder effects that have accompanied the introductions of #M. fijiensis# to Latin America, the Pacific Islands, and Africa have led to a reduction of genetic diversity in these regions. The implications of these results for resistance breeding and disease management will be discussed. Population analysis of #M. fijiensis# should include pathogenic variability studies. The characterization of disease resistance in banana germplasm is also essential for banana breeding. To this order, we are developing an inoculation technique for #M. fijiensis#, using banana leaf pieces. Similar infection patterns and symptom evolution to that observed under field conditions have been obtained. All of the different stages of the #M. fijiensis# life cycle have been reproduced in the leaf piece assay, and resistant phenotypes of cultivars were expressed. The first results obtained of #M. fijiensis# pathogenic variability, and the characterization of resistance within banana, using this technique will be presented

Mots-clés Agrovoc : Musa, Mycosphaerella fijiensis, résistance aux maladies, structure de la population, génétique des populations, amélioration des plantes

Classification Agris : F30 - Génétique et amélioration des plantes
H20 - Maladies des plantes

Auteurs et affiliations

  • Carlier Jean, CIRAD-AMIS-PROTECTION DES CULTURES (FRA) ORCID: 0000-0002-6967-1852
  • El Hadrami Abdelbasset
  • Hayden H.
  • Zapater Marie-Françoise, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
  • Lapeyre Fabienne, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/468069/)

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