Comparative mapping of DNA sequences in rye (Secale
cereale L.) in relation to the rice genome |
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Authors: | B Hackauf S Rudd J R van der Voort T Miedaner P Wehling |
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Institution: | Julius Kühn Institute, Federal Research Institute for Cultivated Plants, Institute for Breeding Research on Agricultural Crops, Erwin-Baur-Str. 27, 06484, Quedlinburg, Germany. zl@jki.bund.de |
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Abstract: | The rice genome has proven a valuable resource for comparative approaches to address individual genomic regions in Triticeae
species at the molecular level. To exploit this resource for rye genetics and breeding, an inventory was made of EST-derived
markers with known genomic positions in rye, which were related with those in rice. As a first inventory set, 92 EST-SSR markers
were mapped which had been drawn from a non-redundant rye EST collection representing 5,423 unigenes and 2.2 Mb of DNA. Using
a BC1 mapping population which involved an exotic rye accession as donor parent, these EST-SSR markers were arranged in a
linkage map together with 25 genomic SSR markers as well as 131 AFLP and four STS markers. This map comprises seven linkage
groups corresponding to the seven rye chromosomes and covers 724 cM of the rye genome. For comparative studies, additional
inventory sets of EST-based markers were included which originated from the rye-mapping data published by other authors. Altogether,
502 EST-based markers with known chromosomal localizations in rye were used for BlastN search and 334 of them could be in
silico mapped in the rice genome. Additionally, 14 markers were included which lacked sequence information but had been genetically
mapped in rice. Based on the 348 markers, each of the seven rye chromosomes could be aligned with distinct portions of the
rice genome, providing improved insight into the status of the rye–rice genome relationships. Furthermore, the aligned markers
provide genomic anchor points between rye and rice, enabling the identification of conserved ortholog set markers for rye.
Perspectives of rice as a model for genome analysis in rye are discussed.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Dedicated to Prof. em. Dr. Dr. h.c. Günter Wricke on occasion of his 80th birthday. |
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