NDLI: Extent and structure of linkage disequilibrium in canola quality winter rapeseed (Brassica napus L.)

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Extent and structure of linkage disequilibrium in canola quality winter rapeseed (Brassica napus L.)

Content Provider	PubMed Central
Author	Ecke, Wolfgang Clemens, Rosemarie Nora, Honsdorf Becker, Heiko C.
Abstract	Linkage disequilibrium was investigated in canola quality winter rapeseed to analyze (1) the prospects for whole-genome association analyses and (2) the impact of the recent breeding history of rapeseed on linkage disequilibrium. A total of 845 mapped AFLP markers with allele frequencies ≥0.1 were used for the analysis of linkage disequilibrium in a population of 85 canola quality winter rapeseed genotypes. A low overall level of linkage disequilibrium was found with a mean r 2 of only 0.027 over all 356,590 possible marker pairs. At a significance threshold of P = 2.8 × 10−7, which was derived by a Bonferroni correction from a global α-level of 0.1, only 0.78% of the marker pairs were in significant linkage disequilibrium. Among physically linked marker pairs, the level of linkage disequilibrium was about five times higher with more than 10% of marker pairs in significant linkage disequilibrium. Linkage disequilibrium decayed rapidly with distance between linked markers with high levels of linkage disequilibrium extending only for about 2 cM. Owing to the rapid decay of linkage disequilibrium with distance association analyses in canola quality rapeseed will have a significantly higher resolution than QTL analyses in segregating populations by interval mapping, but much larger number of markers will be necessary to cover the whole genome. A major impact of the recent breeding history of rapeseed on linkage disequilibrium could not be observed.
Related Links	http://dx.doi.org/10.1007/s00122-009-1221-0
Ending Page	931
Page Count	11
Starting Page	921
File Format	PDF
ISSN	00405752
e-ISSN	14322242
Journal	TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
Issue Number	5
Volume Number	120
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-01
Access Restriction	Open
Rights Holder	Springer-Verlag
Subject Keyword	Biotechnology Agronomy and Crop Science Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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