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Assembly, comparative analysis, and utilization of a single haplotype reference genome for soybean.

Mary Jane C Espina1, John T Lovell2,3, Jerry Jenkins2

  • 1Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota, 55108, USA.

The Plant Journal : for Cell and Molecular Biology
|September 14, 2024
PubMed
Summary

A new soybean reference genome assembly, Wm82.a6, refines the Williams 82 genome with enhanced accuracy. This updated assembly reveals significant genomic heterogeneity and introgression from other soybean cultivars, improving comparative genomics resources.

Keywords:
DNA recombinationGlycine maxcomparative genomicsgenome structure and evolutionnutrient stresspolyploidy

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Area of Science:

  • Plant genomics and genetics
  • Bioinformatics and computational biology
  • Crop science and breeding

Background:

  • The Williams 82 soybean cultivar has been the standard reference genome since 2008.
  • Existing reference genomes exhibit genomic heterogeneity across different sub-lines.
  • Accurate and contiguous genome assemblies are crucial for advancing soybean research.

Purpose of the Study:

  • To provide an updated, high-quality reference genome assembly for soybean (Williams 82, version Wm82.a6).
  • To characterize genomic heterogeneity and introgression within the Williams 82 genome.
  • To generate a high-quality genome assembly for the abiotic stress-resistant cultivar Fiskeby III.

Main Methods:

  • Genome assembly using Pacific Biosciences HiFi long reads.
  • Chromosomal integration utilizing HiC technology.
  • Genome annotation and comparative analysis with existing assemblies and the Fiskeby III genome.

Main Results:

  • A 1.01 Gb genome assembly (Wm82.a6) comprising 36 contigs across 20 soybean chromosomes, with 48,387 gene models.
  • Identification of extensive genomic heterogeneity in Wm82.a6, including introgression from the Kingwa cultivar on chromosomes 03 and 07.
  • Discovery of a novel heterogeneous region (>20 Mb) on chromosome 12 and characterization of polymorphisms between Wm82.a6 and Fiskeby III, particularly within an iron deficiency chlorosis resistance QTL.

Conclusions:

  • The Wm82.a6 assembly offers a more contiguous and accurate representation of the Williams 82 genome, resolving previous heterogeneity.
  • The identified genomic variations highlight the complexity of the Williams 82 genome and provide insights into its evolutionary history.
  • The Wm82.a6 and Fiskeby III genome assemblies significantly enhance soybean comparative and functional genomics capabilities.