Zapater Marie-Françoise, Rivas Gonzalo Galilaeo, El Hadrami Abdelbasset, Abadie Catherine, Cohen Séverine, Loubacky Vincent, Carlier Jean.
2000. Population structure of the fungus Mycosphaerella fijiensis at continental and local scales.
In : 2nd International Symposium on the Molecular and Cellular Biology of Banana, Australie, 29 octobre-3 novembre 2000
Résumé : The ascomycete fungus #Mycosphaerella fijiensis# (anamorph #Paracercospora fijiensis#) causes black leaf streak disease (BLSD), the most destructive leaf disease of bananas. Knowledge of the extent and distribution of variability within #M. fijiensis# is necessary for breeding and managment of BLSD resistance. Study of population genetic structure of #M. fijiensis# at a global scale showed that populations can maintain a high level of genetic diversity and that recombination plays an important role in this pathogen. Thus partial resistance supposed durable is preferentially used in breeding programmes. The objectives of this work was to describe the genetic population structure of #M. fijiensis# at continental and local scales and to evaluate aggressiveness variability within this pathogen. We analysed with molecular markers (CAPS, STMS) samples collected from plantations in Latin American, Caribbean and African countries and in the Philippines. Within localities, we found that the genetic variability is distributed at a small scale up to the plant scale. Within continents, a high level of genetic differentiation was detected between countries and localities suggesting that the spread of the disease is mainly due to the movement of infected plants. Aggressiveness variability was evaluated from two samples collected in Cameroon and the Philippines by inoculation on 5 partially resistant cultivars. This variability was low and similar for the both countries although the level of genetic diversity observed in the Philippines is much higher. No isolates x cultivars-specific interactions were detected. Since only susceptible hosts are cultivated in these countries, these results might be explained by the absence of host selection. (Author's abstract)
Mots-clés Agrovoc : Mycosphaerella fijiensis, structure de la population, variation génétique, Musa
Classification Agris : H20 - Maladies des plantes
Auteurs et affiliations
- Zapater Marie-Françoise, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
- Rivas Gonzalo Galilaeo, CATIE (CRI)
- El Hadrami Abdelbasset, CIRAD-FLHOR-BPA (FRA)
- Abadie Catherine, CIRAD-FLHOR-BPA (CMR)
- Cohen Séverine, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
- Loubacky Vincent, CRBP (CMR)
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Carlier Jean, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
ORCID: 0000-0002-6967-1852
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/476554/)
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