Abstract
Restoration of male fertility is a prerequisite for hybrid rye breeding and currently the most straightforward approach to minimize ergot infection in hybrid rye varieties. Molecular markers are important tools for the efficient introgression and management of restorer genes like Rfp1 originating from unadapted genetic resources. Furthermore, closely linked markers flanking Rfp1 are indispensible for identifying and selecting individuals with haplotypes showing recombination between Rfp1 and other gene(s) that reside in close proximity and have a negative influence on yield. We identified orthologous gene sets in rice, Brachypodium, and Sorghum and used these gene models as templates to establish conserved ortholog set (COS) markers for the restorer gene Rfp1 on the long arm of rye chromosome 4R. The novel co-dominant markers delimit Rfp1 within a 0.7-cM interval and allow prediction of Rfp1 genotypes with a precision not feasible before. The COS markers enabled an alignment of the improved genetic map of rye chromosome 4R with wheat and barley maps and allowed identification of regions orthologous to Rfp1 in wheat and barley on the short arms of chromosomes 6D and 6H, respectively. Results obtained in this study revealed that micro-collinearity around the Rfp1 locus in rye is affected by rearrangements relative to other grass genomes. The impact of the novel COS markers for practical hybrid rye breeding is discussed.
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We gratefully acknowledge excellent technical assistance by Marion Hos, Maria T. Goldfisch and Regina Voss.
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Hackauf, B., Korzun, V., Wortmann, H. et al. Development of conserved ortholog set markers linked to the restorer gene Rfp1 in rye. Mol Breeding 30, 1507–1518 (2012). https://doi.org/10.1007/s11032-012-9736-5
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DOI: https://doi.org/10.1007/s11032-012-9736-5