High-resolution mapping of the Brassica napus Rfp restorer locus using Arabidopsis-derived molecular markers |
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Authors: | Nata?a Formanová Rachel Stollar Rachel Geddy Laetitia Mahé Martin Laforest Benoit S Landry Gregory G Brown |
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Institution: | (1) Department of Biology, McGill University, Montreal, QC, Canada;(2) DNA LandMarks, St-Jean-sur-Richelieu, QC, Canada;(3) Present address: Bayer BioScience N.V., Technologipark 38, 9052 Ghent, Belgium;(4) Present address: Environment and Energy Division, Department of Foreign Affairs and International Trade Canada, 111 Sussex Drive, Ottawa, ON, K1N 1J1, Canada;(5) Present address: Agropolis Fondation, 34394 Montpellier Cedex 5, France;(6) Present address: Percival Consultants, 162 des tournesols, St-Jean-sur-Richelieu, QC, J2W 1H9, Canada; |
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Abstract: | The two forms of cytoplasmic male sterility (CMS) native to the oilseed rape or canola species Brassica napus, nap and pol, have novel features that may provide insight into the molecular mechanisms through which CMS/nuclear restorer systems evolve.
One such feature is the finding that the distinct nuclear restorer genes for the two systems represent different alleles or
haplotypes of the same nuclear locus. Improved understanding of how these systems have evolved will require molecular cloning
and characterization of this novel locus. We have employed an approach that exploits the regional co-linearity between the
Arabidopsis and Brassica genomes to construct a high-resolution genetic map of the nuclear restorer for the pol system, Rfp. Specifically, Arabidopsis-derived sequences have been used as a set of ordered RFLP probes to localize Rfp to a region of the B. napus genome equivalent to a 115 kb interval on Arabidopsis chromosome 1. Based on the known relationship of physical distances between orthologous segments of Arabidopsis and Brassica chromosomes, it is anticipated that the B. napus restorer locus is now mapped to sufficient resolution to permit its isolation and characterization. |
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