- I — Coévolution Hôtes Pathogènes: Caractérisation et Gestion de la Diversité Génétique des deux Partenaires / Co-Evolution Hosts Pathogens: Characterization and Management of Genetic Diversity of Both Partners
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Spatial pattern for resistance to a pathogen. Theoretical approach and empirical approach at the phenotypic and molecular levels
Étude de la distribution spatiale des résistances à un agent pathogène, par des approches théorique et expérimentale aux niveaux phénotypique et moléculaire
Genetics Selection Evolution volume 33, Article number: S3 (2001)
Abstract
A good understanding of the dynamics of host/pathogen interactions and of the factors that shape the spatial distribution of resistance genes is a prerequisite of metapopulation dynamic management of resistance genes. We studied the diversity and spatial structure of natural populations of common bean (Phaseolus vulgaris) for resistance to Colletotrichum lindemuthianum, the causal agent of anthracnose. This study was carried out in Mexico and Argentina both at the phenotypic level and at the molecular level for two families of resistance gene candidates (RGCs). Using a simulation model, we also investigated the effects of migration and selection on the spatial structure of resistance phenotypes in a metapopulation for two genetic determinisms of the interaction (gene-for-gene and matching allele). Our results showed a differentiation between the countries for all the markers and indicated that the RGC, polymorphic in both countries, do not behave as neutral markers. Comparison of the diversities for resistance to strains isolated from wild or cultivated plants suggested that, although there is local adaptation of C. lindemuthianum between the two countries, the coevolution process seems to occur at a very local scale with the maintenance of resistances to allopatric strains, a result consistent with simulations of the models.
Résumé
Un préalable à une gestion dynamique en métapopulation des résistances aux agents pathogènes est une meilleure connaissance des interactions hôte/pathogène et des facteurs qui modifient la répartition spatiale des gènes impliqués dans l’interaction. Nous avons étudié, au Mexique et en Argentine, la diversité et la structuration de populations naturelles de haricot commun (Phaseolus vulgaris) pour la résistance à Colletotrichum lindemuthianum, responsable de l’anthracnose. Cette approche a été menée au niveau phénotypique, au niveau de marqueurs moléculaires neutres (RAPD) et au niveau de deux familles de gènes candidats pour la résistance (RGC). Nos résultats indiquent qu’il existe une différenciation pour tous les marqueurs entre les deux pays et que les RGC, polymorphes dans les deux pays, ne se comportent pas comme des marqueurs neutres. La comparaison des diversités pour les résistances à des souches sauvages ou isolées de cultivars suggère que, bien qu’il existe une adaptation de C. lindemuthianum à l’échelle des deux pays, la coévolution se ferait à une échelle très locale et maintiendrait des résistances à des souches allopatriques. Par ailleurs, nous avons simulé sur une métapopulation l’effet de la migration et de la sélection sur la répartition spatiale des phénotypes de résistance pour deux déterminismes génétiques de l’interaction (gène pour gène et „matching allele”). Pour les mêmes valeurs de paramètres, le niveau de com-patibilité locale est moins élevé pour un déterminisme de type gène pour gène que „matching allele”, l’asymétrie du système gène pour gène favorisant l’hôte lorsque de nombreux loci sont en jeu. Globalement, le niveau d’adaptation locale du parasite diminue lorsque la migration de l’hôte augmente. Une maladaptation locale peut même être observée, en particulier dans un système gène pour gène, si les pressions de sélection réciproques sont fortes. Dans le détail, le test d’une population d’agents pathogènes sur l’ensemble des populations hôtes indique que certaines populations hôtes possèdent des résistances à des populations pathogènes éloignées, et ce quel que soit le niveau d’adaptation locale. Ce résultat est cohérent avec ce qui est observé dans les données expérimentales.
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Neema, C., Lavigne, C., de Meaux, J. et al. Spatial pattern for resistance to a pathogen. Theoretical approach and empirical approach at the phenotypic and molecular levels. Genet Sel Evol 33 (Suppl 1), S3 (2001). https://doi.org/10.1186/BF03500870
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DOI: https://doi.org/10.1186/BF03500870
Keywords
- fungal pathogen
- model
- resistance
- population structure
- wild populations
- Collet otrichum lindemuthianum
- Phaseolus vulgaris