Convergent adaptation to quantitative host resistance in a major plant pathogen

Carlier Jean, Bonnot François, Roussel Véronique, Ravel Sébastien, Martinez Reina Teresa, Perez-Vicente Luis, Abadie Catherine, Wright Stephen. 2021. Convergent adaptation to quantitative host resistance in a major plant pathogen. Mbio, 12 (1):e03129-20, 18 p.

Quartile : Q1, Sujet : MICROBIOLOGY

Résumé : Plant pathogens can adapt to quantitative resistance, eroding its effectiveness. The aim of this work was to reveal the genomic basis of adaptation to such a resistance in populations of the fungus Pseudocercospora fijiensis, a major devastating pathogen of banana, by studying convergent adaptation on different cultivars. Samples from P. fijiensis populations showing a local adaptation pattern on new banana hybrids with quantitative resistance were compared, based on a genome scan approach, with samples from traditional and more susceptible cultivars in Cuba and the Dominican Republic. Whole-genome sequencing of pools of P. fijiensis isolates (pool-seq) sampled from three locations per country was conducted according to a paired population design. The findings of different combined analyses highly supported the existence of convergent adaptation on the study cultivars between locations within but not between countries. Five to six genomic regions involved in this adaptation were detected in each country. An annotation analysis and available biological data supported the hypothesis that some genes within the detected genomic regions may play a role in quantitative pathogenicity, including gene regulation. The results suggested that the genetic basis of fungal adaptation to quantitative plant resistance is at least oligogenic, while highlighting the existence of specific host-pathogen interactions for this kind of resistance.

Mots-clés Agrovoc : champignon pathogène, pathologie végétale, résistance aux organismes nuisibles, relation hôte pathogène, Musa (bananes), phytogénétique

Mots-clés géographiques Agrovoc : République dominicaine, Cuba, Honduras

Mots-clés complémentaires : Pseudocercospora fijiensis

Mots-clés libres : Convergent adaptation, Fungal plant pathogen, Genome scan, Quantitative resistance, Pseudocercospora fijiensis

Classification Agris : H20 - Maladies des plantes
H50 - Troubles divers des plantes
F30 - Génétique et amélioration des plantes

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

Agences de financement européennes : European Commission

Programme de financement européen : FP7

Projets sur financement : (EU) Genetic basis of host adaptative traits in the plant pathogenic fungus Mycosphaerella fijiensis

Auteurs et affiliations

• Carlier Jean, CIRAD-BIOS-UMR PHIM (FRA) ORCID: 0000-0002-6967-1852 - auteur correspondant
• Bonnot François, CIRAD-BIOS-UMR BGPI (FRA)
• Roussel Véronique, CIRAD-BIOS-UMR PHIM (FRA)
• Ravel Sébastien, CIRAD-BIOS-UMR PHIM (FRA) ORCID: 0000-0001-6663-782X
• Martinez Reina Teresa, IDIAF (DOM)
• Perez-Vicente Luis, INISAV (CUB)
• Abadie Catherine, CIRAD-BIOS-UMR PHIM (FRA)
• Wright Stephen, Université de Toronto (CAN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597720/)

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