Abstract
The exponential development of molecular markers enables a more effective study of the genetic architecture of traits of economic importance, like test weight in wheat (Triticum aestivum L.), for which a high value is desired by most end-users. The association mapping (AM) method now allows more precise exploration of the entire genome. AM requires populations with substantial genetic variability of the traits of interest. The breeding lines at the end of a selection cycle, characterized for numerous traits, represent a potentially useful population for AM studies. Using three elite line populations, selected by several breeders and genotyped with about 2,500 Diversity Arrays Technology markers, several associations were identified between these markers and test weight, grain yield and heading date. To minimize spurious associations, we compared the general linear model and mixed linear model (MLM), which adjust for population structure and kinship differently. The MLM model with the kinship matrix was the most efficient. Finally, elite lines from several breeding programs had sufficient genetic variability to allow for the mapping of several chromosomal regions involved in the variation of three important traits.
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Abbreviations
- AM:
-
Association mapping
- DH:
-
Doubled haploid
- GLM:
-
General linear model
- GY:
-
Grain yield
- HD:
-
Heading date
- LD:
-
Linkage disequilibrium
- MLM:
-
Mixed linear model
- PCA:
-
Principal component analysis
- QTL:
-
Quantitative trait locus/loci
- RIL:
-
Recombinant inbred line
- TW:
-
Test weight
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This project was funded by the FSOV (Fonds de Soutien à l’Obtention Végétale) under grant FSOV2008A.
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Bordes, J., Goudemand, E., Duchalais, L. et al. Genome-wide association mapping of three important traits using bread wheat elite breeding populations. Mol Breeding 33, 755–768 (2014). https://doi.org/10.1007/s11032-013-0004-0
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DOI: https://doi.org/10.1007/s11032-013-0004-0