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Cappelle-en-Pévèle, France

Humbroich K.,Justus Liebig University | Jaiser H.,Pajbjergfonden | Schiemann A.,Pajbjergfonden | Devaux P.,SAS Florimond Desprez Veuve and Fils | And 5 more authors.
Plant Breeding | Year: 2010

With 1 figureThe Taiwanese barley (Hordeum vulgare L.) cultivar 'Taihoku A', which has been described as resistant to Barley mild mosaic virus (BaMMV), Barley yellow mosaic virus (BaYMV) and BaYMV-2, contains the BaMMV resistance gene rym13 located on chromosome 4HL. Furthermore, 'Taihoku A' shows resistance to the newly detected virus strain BaMMV-Teik, which is able to overcome the resistance gene rym5. By analysing a set of 154 DH-lines of the cross 'Taihoku A' x 'Plaisant' it turned out that resistance to BaMMV-Teik is inherited in a monogenic manner, the gene located on chromosome 4HL. Resistance to BaMMV-Teik is also encoded by rym13 or an additional gene being closer linked to rym13 than 0.65 centiMorgan (cM). Using bulked segregant analysis employing Simple sequence repeats (SSRs) and Amplified fragment length polymorphisms (AFLPs), a map comprising 39.1 cM was constructed with the closest marker linked to the BaMMV/BaMMV-Teik resistance at a distance of 1 cM. Respective markers are useful tools to introduce resistance to BaMMV-Teik into adapted breeding lines carrying other resistance genes, which are not effective against all BaMMV/BaYMV strains known in Europe, e.g. rym4, rym5. © 2009 Blackwell Verlag GmbH.

Mangin B.,French National Institute for Agricultural Research | Mangin B.,French National Center for Scientific Research | Sandron F.,French National Institute for Agricultural Research | Henry K.,SAS Florimond Desprez Veuve and Fils | And 4 more authors.
Theoretical and Applied Genetics | Year: 2015

Key message: Genetic diversity in worldwide population of beets is strongly affected by the domestication history, and the comparison of linkage disequilibrium in worldwide and elite populations highlights strong selection pressure. Abstract: Genetic relationships and linkage disequilibrium (LD) were evaluated in a set of 2035 worldwide beet accessions and in another of 1338 elite sugar beet lines, using 320 and 769 single nucleotide polymorphisms, respectively. The structures of the populations were analyzed using four different approaches. Within the worldwide population, three of the methods gave a very coherent picture of the population structure. Fodder beet and sugar beet accessions were grouped together, separated from garden beets and sea beets, reflecting well the origins of beet domestication. The structure of the elite panel, however, was less stable between clustering methods, which was probably because of the high level of genetic mixing in breeding programs. For the linkage disequilibrium analysis, the usual measure (r2) was used, and compared with others that correct for population structure and relatedness (rS 2, rV 2, rVS 2). The LD as measured by r2 persisted beyond 10 cM within the elite panel and fell below 0.1 after less than 2 cM in the worldwide population, for almost all chromosomes. With correction for relatedness, LD decreased under 0.1 by 1 cM for almost all chromosomes in both populations, except for chromosomes 3 and 9 within the elite panel. In these regions, the larger extent of LD could be explained by strong selection pressure. © 2015, Springer-Verlag Berlin Heidelberg.

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