Dans l’«Institutional Repository», vous trouvez les publications des chercheuses et chercheurs d’Agroscope. Lorsque la publication est en libre accès sous forme de PDF, elle peut être téléchargée. Si ce n’est pas le cas, à l’aide de la référence de la publication, vous pouvez voir où elle a été publiée.
En saisissant le code Web une publication est accessibles directement.
Pour les publications Agroscope, le code web est affiché en bas de la page de détail d'une publication: ID publication (code web) : 12345
En introduisant une terme de recherche vous pouvez rechercher les métadonnées d'une publication: Titre, Sous-titre, Résumé, Nom de la source, ISBN, ISSN, DOI, Mots-clé
Avec la recherche en plein texte le contenu de fichiers PDF est recherché; Notes pour la recherche.
Multi-location trials and population-based genotyping reveal high diversity and adaptation to breeding environments in a large collection of red clover.
Red clover (Trifolium pratense L.) is an outcrossing forage legume that has adapted to a wide range of climatic and growing conditions across Europe. Red clover is valued for its high yield potential and its forage quality. The high amount of genetic diversity present in red clover provides an invaluable, but often poorly characterized resource to improve key traits such as yield, quality, and resistance to biotic and abiotic stresses. In this study, we examined the genetic and phenotypic diversity within a diverse set of 395 diploid red clover accessions via genome wide allele frequency fingerprinting and multi-location field trials across Europe. We found that the genetic structure of accessions mostly reflected their geographic origin and only few cases were detected, where breeders integrated foreign genetic resources into their local breeding pools. The mean dry matter yield of the first main harvesting season ranged from 0.74 kg m-2 in Serbia and Norway to 1.34 kg m-2 in Switzerland. Phenotypic performance of accessions in the multi-location field trials revealed a very strong accession x location interaction. Local adaptation was especially prominent in Nordic red clover accessions that showed a distinct adaptation to the growing conditions and cutting regime of the North. The traits vigor, dry matter yield and plant density were negatively correlated between the trial location in Norway and the locations Great Britain, Switzerland, Czech Republic and Serbia. Notably, breeding material and cultivars generally performed well at the location where they were developed. Our results confirmed that red clover cultivars were bred from regional ecotypes and show a narrow adaptation to regional conditions. Our study can serve as a valuable basis for identifying interesting materials that express the desired characteristics and contribute to the adaptation of red clover to future climatic conditions.
