Abstract
The presence of a monosomic gametocidal chromosome (GC) in a barley chromosome addition line of common wheat generates structural aberrations in the barley chromosome as well as in the wheat chromosomes of gametes lacking the GC. A collection of structurally aberrant barley chromosomes is analogous to a panel of radiation hybrid (RH) mapping and is valuable for high-throughput physical mapping. We developed 90 common wheat lines (GC lines) containing aberrant barley 7H chromosomes induced by a gametocidal chromosome, 2C. DNAs isolated from these GC lines provided a panel of 7H chromosomal fragments in a wheat genetic background, comparable with RH mapping panels in mammals. We used this 7H GC panel and the methodology for RH mapping to physically map PCR-based barley markers, SSRs and AFLPs, onto chromosome 7H, relying on polymorphism between the 7H chromosome and the wheat genome. We call this method GC mapping. This study describes a novel adaptation and combination of methods of inducing chromosomal rearrangements to produce physical maps of markers. The advantages of the presented method are similar to RH mapping in that non-polymorphic markers can be used and the mapping panels can be relatively easily obtained. In addition, mapping results are cumulative when using the same mapping set with new markers. The GC lines will be available from the National Bioresources Project-KOMUGI (http://www.nbrp.jp/index.jsp).
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Acknowledgements
This study was supported in part by a Grant-in-Aid for Scientific Research (A) (No. 123066001) from the Ministry of Education, Science, Sports, and Culture, Japan and facilitated by a BBRSC Japan Partnering award to R. Waugh and T.R. Endo. Technical help from Malcolm Macaulay is much appreciated. Contribution No. 582 from the Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University, Japan.
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Masoudi-Nejad, A., Nasuda, S., Bihoreau, MT. et al. An alternative to radiation hybrid mapping for large-scale genome analysis in barley. Mol Genet Genomics 274, 589–594 (2005). https://doi.org/10.1007/s00438-005-0052-1
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DOI: https://doi.org/10.1007/s00438-005-0052-1