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United States Department of Agriculture

Agricultural Research Service

Title: A Consensus Map of Rye Integrating Mapping Data from Five Mapping Populations

item Gustafson, J
item Ma, Xue Feng
item Korzun, Viktor
item Snape, John

Submitted to: Theoretical and Applied Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/13/2008
Publication Date: 12/9/2008
Citation: Gustafson, J.P., Ma, X., Korzun, V., Snape, J.W. 2008. A Consensus Map of Rye Integrating Mapping Data from Five Mapping Populations. Theoretical and Applied Genetics. 118:793-800.

Interpretive Summary: Five individual rye genetic linkage maps have been published to describe the arrangement of genes within the rye genome. The publications that describe these maps each list hundreds of genetic markers. The maps and markers listed in the publications could be useful in marker-assisted breeding programs to improve rye production, and to accelerate the transfer of rye gene complexes into wheat. Unfortunately, each of the maps was created in a different laboratory using different rye parents and marker systems. The vagaries that result from these different origins and constructions make it very difficult to utilize any of the data or markers in marker-assisted breeding programs. A study was designed, using the JoinMap 2.0 statistical mapping program, to combine each of the five published maps into a single common consensus. The resulting map contains 503 markers and is comprised of both dominant and co-dominant markers from the individual maps. This rye consensus map will have an impact in marker-assisted breeding programs that are interested in the improvement of rye production, and in programs designed to transfer rye gene complexes into wheat.

Technical Abstract: A consensus map of rye (Secale cereale L.) was constructed using JoinMap 2.0 based on mapping data obtained from five different mapping populations, including 'UC90' × 'E-line' (Ma et al. 2001), 'P87' × 'P105' (Korzun et al. 1998), 'I0.1-line' × 'I0.1-line' (Senft and Wricke 1996), 'E-line' × 'R-line' (Loarce et al. 1996), and 'Ds2' × 'RxL10' (Devos et al. 1993). The integration of the five mapping populations resulted in a map containing 503 markers (ranging from 57 on 1R to 86 on 4R), and covers 763.2 cM (ranging from 71.5 cM on 2R to 148.7 cM on 4R). Analysis of the data indicated that many large recombinational gaps between loci were consistent from population to population, which indicated that the gaps in rye were inherited and occurred within a wide range of germplasm. In addition to large gaps between loci, the clustering of loci was also noted indicating the existence of several gene-rich regions within rye. The comparison of the individual maps to the consensus map revealed that the linear locus order was generally in good agreement between the various populations. There was some reordering of segments from individual maps, but this reordering could be due to inversions or translocations between the parents of the various populations, or to the type of loci used in creating the maps, or the mapping data. The general conservation of the linear locus order indicated a high degree of reliability of the rye consensus map. A uniform suppression of recombination was observed around rye centromeres.

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