Clonality and host selection in the wheat pathogenic fungus Puccinia triticina
Clonal reproduction in Puccinia triticina, the cause of wheat leaf rust, has long been hypothesized but has never been demonstrated. Using a population genetics approach and microsatellite markers, we analysed genetic diversity of this fungus at each level of genome organisation. Sampling included isolates from two field populations growing on two cultivars carrying specific resistance genes, completed with isolates representing the main pathotypes identified from a national survey. For the two cultivars, populations differentiated according to the distribution of their genotypes and pathotypes. There was a high proportion of repeated genotypes, combined with a significant linkage disequilibrium and a strong negative value for FIS. These three factors, especially heterozygote excess, strongly support the hypothesis of a high rate of clonal reproduction. Each pathotype matched a unique multilocus genotype, except for a few isolates, which were taken to be mutants of the dominant genotype. We discussed the strong relationship between pathotypes and genotypes as the consequence of clonal reproduction combined with a strong selection exerted by host cultivars.
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dig-cirad-fr-5472592022-12-30T18:29:45Z http://agritrop.cirad.fr/547259/ http://agritrop.cirad.fr/547259/ Clonality and host selection in the wheat pathogenic fungus Puccinia triticina. Goyeau Henriette, Halkett Fabien, Zapater Marie-Françoise, Carlier Jean, Lannou Christian. 2007. Fungal Genetics and Biology, 44 (6) : 474-483.https://doi.org/10.1016/j.fgb.2007.02.006 <https://doi.org/10.1016/j.fgb.2007.02.006> Researchers Clonality and host selection in the wheat pathogenic fungus Puccinia triticina Goyeau, Henriette Halkett, Fabien Zapater, Marie-Françoise Carlier, Jean Lannou, Christian eng 2007 Fungal Genetics and Biology H20 - Maladies des plantes Clonal reproduction in Puccinia triticina, the cause of wheat leaf rust, has long been hypothesized but has never been demonstrated. Using a population genetics approach and microsatellite markers, we analysed genetic diversity of this fungus at each level of genome organisation. Sampling included isolates from two field populations growing on two cultivars carrying specific resistance genes, completed with isolates representing the main pathotypes identified from a national survey. For the two cultivars, populations differentiated according to the distribution of their genotypes and pathotypes. There was a high proportion of repeated genotypes, combined with a significant linkage disequilibrium and a strong negative value for FIS. These three factors, especially heterozygote excess, strongly support the hypothesis of a high rate of clonal reproduction. Each pathotype matched a unique multilocus genotype, except for a few isolates, which were taken to be mutants of the dominant genotype. We discussed the strong relationship between pathotypes and genotypes as the consequence of clonal reproduction combined with a strong selection exerted by host cultivars. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/547259/1/document_547259.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.fgb.2007.02.006 10.1016/j.fgb.2007.02.006 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fgb.2007.02.006 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.fgb.2007.02.006 |
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H20 - Maladies des plantes H20 - Maladies des plantes Goyeau, Henriette Halkett, Fabien Zapater, Marie-Françoise Carlier, Jean Lannou, Christian Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| description |
Clonal reproduction in Puccinia triticina, the cause of wheat leaf rust, has long been hypothesized but has never been demonstrated. Using a population genetics approach and microsatellite markers, we analysed genetic diversity of this fungus at each level of genome organisation. Sampling included isolates from two field populations growing on two cultivars carrying specific resistance genes, completed with isolates representing the main pathotypes identified from a national survey. For the two cultivars, populations differentiated according to the distribution of their genotypes and pathotypes. There was a high proportion of repeated genotypes, combined with a significant linkage disequilibrium and a strong negative value for FIS. These three factors, especially heterozygote excess, strongly support the hypothesis of a high rate of clonal reproduction. Each pathotype matched a unique multilocus genotype, except for a few isolates, which were taken to be mutants of the dominant genotype. We discussed the strong relationship between pathotypes and genotypes as the consequence of clonal reproduction combined with a strong selection exerted by host cultivars. |
| format |
article |
| topic_facet |
H20 - Maladies des plantes |
| author |
Goyeau, Henriette Halkett, Fabien Zapater, Marie-Françoise Carlier, Jean Lannou, Christian |
| author_facet |
Goyeau, Henriette Halkett, Fabien Zapater, Marie-Françoise Carlier, Jean Lannou, Christian |
| author_sort |
Goyeau, Henriette |
| title |
Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| title_short |
Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| title_full |
Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| title_fullStr |
Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| title_full_unstemmed |
Clonality and host selection in the wheat pathogenic fungus Puccinia triticina |
| title_sort |
clonality and host selection in the wheat pathogenic fungus puccinia triticina |
| url |
http://agritrop.cirad.fr/547259/ http://agritrop.cirad.fr/547259/1/document_547259.pdf |
| work_keys_str_mv |
AT goyeauhenriette clonalityandhostselectioninthewheatpathogenicfunguspucciniatriticina AT halkettfabien clonalityandhostselectioninthewheatpathogenicfunguspucciniatriticina AT zapatermariefrancoise clonalityandhostselectioninthewheatpathogenicfunguspucciniatriticina AT carlierjean clonalityandhostselectioninthewheatpathogenicfunguspucciniatriticina AT lannouchristian clonalityandhostselectioninthewheatpathogenicfunguspucciniatriticina |
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