Etude de la structuration génétique de populations de Melampsora larici-populina, agent de la rouille du peuplier, à différentes échelles spatiales

Abstract : Since 25 years, the poplar rust fungus, Melampsora larici-populina, is responsible of the most important phytosanitary problems in poplar cultivation. Direct study of biological characteristics, such as dispersal distances or relative importance of sexual vs. asexual reproduction, is often difficult in such pathogenic fungi. A way to infer these characteristics is the use of molecular markers. Fifteen microsatellite markers were developed in order to perform population genetics studies of M. larici-populina at different spatial scales. At a fine scale (leave, twig, tree, site) a great genotypic diversity was observed, as well as a significant structure at the site and tree scales. At a regional scale, the study of M. larici-populina populations in the Durance River valley corridor revealed the co-occurrence of two epidemics, in the wild and in the cultivated compartment. Furthermore, exchanges from cultivated stands to wild stands were shown. The Long distance migration capacity of M. larici-populina was assessed by studying eight European populations and two populations recently founded in Iceland and Canada. European populations exhibited an isolation by distance pattern, whereas non-European populations appeared to result from a long distance dispersal of a limited number of individuals.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0145_BARRES.pdf
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Submitted on : Friday, March 30, 2018 - 9:44:07 AM
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Benoît Barrès. Etude de la structuration génétique de populations de Melampsora larici-populina, agent de la rouille du peuplier, à différentes échelles spatiales. Sciences agricoles. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10145⟩. ⟨tel-01754301⟩

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