A framework for gene mapping in wheat demonstrated using the Yr7 yellow rust resistance gene

We used three approaches to map the yellow rust resistance gene Yr7 and identify associated SNPs in wheat. First, we used a traditional QTL mapping approach using a double haploid (DH) population and mapped Yr7 to a low-recombination region of chromosome 2B. To fine map the QTL, we then used an association mapping panel. Both populations were SNP array genotyped allowing alignment of QTL and genome-wide association scans based on common segregating SNPs. Analysis of the association panel spanning the QTL interval, narrowed the interval down to a single haplotype block. Finally, we used mapping-by-sequencing of resistant and susceptible DH bulks to identify a candidate gene in the interval showing high homology to a previously suggested Yr7 candidate and to populate the Yr7 interval with a higher density of polymorphisms. We highlight the power of combining mapping-by-sequencing, delivering a complete list of gene-based segregating polymorphisms in the interval with the high recombination, low LD precision of the association mapping panel. Our mapping-by-sequencing methodology is applicable to any trait and our results validate the approach in wheat, where with a near complete reference genome sequence, we are able to define a small interval containing the causative gene.

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  • Name: Gardiner, Laura-Jayne, Type: Corresponding Author,
  • Name: Bansept-Basler, Pauline, Type: Author,
  • Name: El-Soda, Mohamed, Type: Author,
  • Name: Hall, Anthony, Type: Author,
  • Name: O’Sullivan, Donal M., Type: Author,
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Citation Report https://scite.ai/reports/10.1371/journal.pone.0231157
DFW Organisation EI
DFW Work Package 4
DOI 10.1371/journal.pone.0231157
Date Last Updated 2021-03-04T14:00:05.753029
Evidence oa journal (via doaj)
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Journal Is Open Access true
Open Access Status gold
PDF URL https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0231157&type=printable
Publisher URL https://doi.org/10.1371/journal.pone.0231157