Molecular diversity of sunflower populations maintained as genetic resources is affected by multiplication processes and breeding for major traits. - Laboratoire des Interactions Plantes Microbes Environnement Accéder directement au contenu
Article Dans Une Revue TAG Theoretical and Applied Genetics Année : 2017

Molecular diversity of sunflower populations maintained as genetic resources is affected by multiplication processes and breeding for major traits.

Résumé

The molecular diversity in a set of 114 cultivated sunflower populations was studied by single-nucleotide polymorphism genotyping. These populations were chosen as representative of the 400 entries in the INRA collection received or developed between 1962 and 2011 and made up of land races, open-pollinated varieties, and breeding pools. Mean allele number varied from 1.07 to 1.90. Intra population variability was slightly reduced according to the number of multiplications since entry but some entries were probably largely homozygous when received. A principal component analysis was used to study inter-population variability. The first 3 axes accounted for 17% of total intra-population variability. The first axis was significantly correlated with seed oil content, more closely than just the distinction between oil and confectionary types. The second axis was related to the presence or absence of restorer genes and the third axis to flowering date and possibly to adaptation to different climates. Our results provide argument shighlighting the effect of the maintenance process on the within population genetic variability as well as on the impact of breeding for major agronomic traits on the between population variability of the collection. Propositions are made to improve sunflower population maintenance procedures to keep maximum genetic variability for future breeding.
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Dates et versions

hal-01603801 , version 1 (02-10-2017)

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Brigitte Mangin, Nicolas Pouilly, Marie-Claude Boniface, Nicolas Langlade, Patrick Vincourt, et al.. Molecular diversity of sunflower populations maintained as genetic resources is affected by multiplication processes and breeding for major traits.. TAG Theoretical and Applied Genetics, 2017, 130 (6), pp.1099-1112. ⟨10.1007/s00122-017-2872-x⟩. ⟨hal-01603801⟩
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