Elite durum wheat genetic map and recombination rate variation in a multiparental connected design |
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Authors: | Laurence Vaissayre Morgane Ardisson Christiane Borries Sylvain Santoni Jacques David Pierre Roumet |
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Institution: | (1) INRA-UMR Am?lioration G?n?tique et adaptation des Plantes, 2 Place Viala, 34060 Montpellier Cedex 2, France;(2) SupAgro-UMR Am?lioration G?n?tique et adaptation des Plantes, 2 Place Viala, 34060 Montpellier Cedex 2, France; |
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Abstract: | Genetic maps published for elite durum wheat (Triticum turgidum durum Desf.), were mainly related to Italian and North American pools. To provide additional information dedicated to durum elite pool,
a recombinant inbred population (217 RILs) derived form 2 French commercial varieties (Ixos and Primadur), has been mapped
with 529 loci (98 AFLPs, 67 SSRs, 1 ISBP and 363 DArTs). Genetic map spanned a total of 2,082 cM (5.7 cM/marker on average).
Recombination rate variation over the genome was documented through the analysis of six segregating populations representing
a total of 48 RILs × 6, issued from an half diallel design based on four elite lines—Neodur, Ixos, Lloyd and Primadur—including
the 2 previous genitors. Each set of three genetically connected populations (48 RILs × 3) was used to build the consensus
parental maps for each genitor. To construct the four consensus parental maps, marker ordering was determined on 217 RILs
map which was an extended population of the most polymorphic cross (Ixos × Primadur). Sizeable, recombination rate variation
has been observed between the four parental maps both at the marker pair scale and at the linkage group scale. Two of the
parents, Lloyd and Primadur, had strong, opposite effects increasing and decreasing, respectively the recombination rate.
Additional studies are proposed to increase our understanding of this variation, with the identification of environmental
or genetic factors affecting recombination rate. |
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