title: Local adaptation and population structure at a micro-geographical scale of a fungal parasite on its host plant.
abstract: Local adaptation, which has been detected for several wild pathosystems is influenced by gene flow and recombination. In this study, we investigate local adaptation and population structure at a fine scale in wild populations of a plant-pathogen fungus. We sampled hierarchically strains of Colletotrichum lindemuthianum in a wild population of its host. The analysis of AFLP patterns obtained for 86 strains indicated that: (i) many different haplotypes can be discriminated, although occurrence of recombination could not be shown; (ii) migration between adjacent plants seemed rare during the season; and (iii) neutral diversity is structured according to groups of plants and individual host plants. Furthermore, we tested for the occurrence of local adaptation using a cross-inoculation experiment. Our results showed local adaptation at the scale of the individual host plant. These results indicate that fine-scale dynamics has evolutionary consequences in this pathosystem.
authors.affiliation: UMR de Pathologie Végétale, INA-PG, Paris Cedex 05, France.
authors.forename: J
authors.initials: J
authors.lastname: Capelle
authors.forename: C
authors.initials: C
authors.lastname: Neema
mesh_terms: D000220:Adaptation, Biological / Q000235:genetics* / Q000502:physiology; D001203:Ascomycota / Q000235:genetics* / Q000502:physiology*; D005819:Genetic Markers / Q000235:genetics; D014644:Genetic Variation; D005828:Genetics, Population; D005838:Genotype; D005843:Geography; D006239:Haplotypes / Q000235:genetics; D021141:Nucleic Acid Amplification Techniques; D027805:Phaseolus / Q000382:microbiology*; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D005819:Genetic Markers