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An eight-parent multiparent advanced generation inter-cross population for winter-sown wheat: creation, properties, and validation.


ABSTRACT: MAGIC populations represent one of a new generation of crop genetic mapping resources combining high genetic recombination and diversity. We describe the creation and validation of an eight-parent MAGIC population consisting of 1091 F7 lines of winter-sown wheat (Triticum aestivum L.). Analyses based on genotypes from a 90,000-single nucleotide polymorphism (SNP) array find the population to be well-suited as a platform for fine-mapping quantitative trait loci (QTL) and gene isolation. Patterns of linkage disequilibrium (LD) show the population to be highly recombined; genetic marker diversity among the founders was 74% of that captured in a larger set of 64 wheat varieties, and 54% of SNPs segregating among the 64 lines also segregated among the eight founder lines. In contrast, a commonly used reference bi-parental population had only 54% of the diversity of the 64 varieties with 27% of SNPs segregating. We demonstrate the potential of this MAGIC resource by identifying a highly diagnostic marker for the morphological character "awn presence/absence" and independently validate it in an association-mapping panel. These analyses show this large, diverse, and highly recombined MAGIC population to be a powerful resource for the genetic dissection of target traits in wheat, and it is well-placed to efficiently exploit ongoing advances in phenomics and genomics. Genetic marker and trait data, together with instructions for access to seed, are available at http://www.niab.com/MAGIC/.

SUBMITTER: Mackay IJ 

PROVIDER: S-EPMC4169152 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

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An eight-parent multiparent advanced generation inter-cross population for winter-sown wheat: creation, properties, and validation.

Mackay Ian J IJ   Bansept-Basler Pauline P   Barber Toby T   Bentley Alison R AR   Cockram James J   Gosman Nick N   Greenland Andy J AJ   Horsnell Richard R   Howells Rhian R   O'Sullivan Donal M DM   Rose Gemma A GA   Howell Phil J PJ  

G3 (Bethesda, Md.) 20140918 9


MAGIC populations represent one of a new generation of crop genetic mapping resources combining high genetic recombination and diversity. We describe the creation and validation of an eight-parent MAGIC population consisting of 1091 F7 lines of winter-sown wheat (Triticum aestivum L.). Analyses based on genotypes from a 90,000-single nucleotide polymorphism (SNP) array find the population to be well-suited as a platform for fine-mapping quantitative trait loci (QTL) and gene isolation. Patterns  ...[more]

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