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Using Next Generation Sequencing for Multiplexed Trait-Linked Markers in Wheat.

Amy Bernardo1, Shan Wang2, Paul St Amand3

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|December 2, 2015
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Summary

Developing multiplexed SNP assays using next-generation sequencing (NGS) enhances marker-assisted selection (MAS) efficiency in wheat. This study successfully multiplexed 27 SNP markers for rapid, high-throughput genotyping of important agronomic traits.

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Area of Science:

  • Agricultural Science
  • Genetics
  • Molecular Biology

Background:

  • Single nucleotide polymorphisms (SNPs) are key markers for crop genotyping, but their application in wheat marker-assisted selection (MAS) is limited.
  • Current SNP assays for wheat MAS are typically uniplex, hindering high-throughput analysis.
  • Multiplexing SNP assays allows simultaneous analysis of multiple markers, significantly increasing MAS efficiency.

Purpose of the Study:

  • To develop and validate a multiplexed assay for genotyping important agronomic traits in bread wheat using next-generation sequencing (NGS).
  • To increase the efficiency of marker-assisted selection (MAS) in wheat through simultaneous analysis of multiple SNP and indel markers.

Main Methods:

  • Designed 33 locus-specific markers (SNP/indel) linked to 20 quantitative trait loci (QTL) or genes in wheat.
  • Analyzed amplicon sequences using an Ion Torrent Proton Sequencer and a custom allele detection pipeline.
  • Validated genotype calls using Kompetitive Allele-Specific PCR (KASP) and Sequence Tagged Site (STS) markers.

Main Results:

  • Successfully multiplexed 27 out of 33 designed markers.
  • Achieved 100% SNP call rates for 23 markers.
  • Genotype calls were fully verified by KASP and STS markers, confirming assay accuracy.

Conclusions:

  • The developed NGS-based multiplexed assay is effective for rapid, high-throughput screening of SNPs and indel markers in wheat.
  • This assay significantly improves the efficiency of MAS for important agronomic traits in wheat breeding programs.
  • Facilitates advanced breeding strategies by enabling simultaneous genotyping of multiple markers.