High-density linkage mapping and distribution of segregation distortion regions in the oak genome

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Bodénès, Catherine, Bodenes-Brezard | Chancerel, Emilie, E. | Ehrenmann, François | Kremer, Antoine | Plomion, Christophe

Edité par CCSD ; Oxford University Press (OUP) -

International audience. We developed the densest single-nucleotide polymorphism (SNP)-based linkage genetic map to date for the genusQuercus An 8k gene-based SNP array was used to genotype more than 1,000 full-sibs from two intraspecific and two interspecific full-sib families ofQuercus petraeaandQuercus robur A high degree of collinearity was observed between the eight parental maps of the two species. A composite map was then established with 4,261 SNP markers spanning 742 cM over the 12 linkage groups (LGs) of the oak genome. Nine genomic regions from six LGs displayed highly significant distortions of segregation. Two main hypotheses concerning the mechanisms underlying segregation distortion are discussed: genetic load vs. reproductive barriers. Our findings suggest a predominance of pre-zygotic to post-zygotic barriers.

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