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A haplotype-resolved reference genome for Eucalyptus grandis.

Anneri Lötter1, Tomas Bruna2, Tuan A Duong1

  • 1Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Private Bag X20, Pretoria 0028, South Africa.

G3 (Bethesda, Md.)
|May 30, 2025
PubMed
Summary
This summary is machine-generated.

This study presents an improved Eucalyptus grandis genome assembly (v4.0) using advanced sequencing technologies. The new assembly offers higher accuracy and completeness, crucial for advancing molecular breeding in this vital forestry feedstock.

Keywords:
Eucalyptus grandisgenome improvementphased assemblysyntenytandem duplications

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Area of Science:

  • Genomics
  • Plant Science
  • Forestry

Background:

  • Eucalyptus grandis is a key hardwood species for timber and biomass production.
  • The v2.0 genome reference has been instrumental in developing molecular breeding tools for eucalypts.
  • Advancements in sequencing technology enable more comprehensive genome analysis.

Purpose of the Study:

  • To produce an improved, haplotype-phased genome assembly (v4.0) for Eucalyptus grandis.
  • To enhance the accuracy and completeness of the E. grandis genome reference.
  • To facilitate further research in molecular breeding and population genetics of E. grandis.

Main Methods:

  • Utilized PacBio HiFi long reads and Omni-C proximity ligation sequencing.
  • Generated a haplotype-phased assembly (v4.0) for an E. grandis selection (TAG0014).
  • Analyzed assembly size, contiguity, telomere capture, gene models, and repeat content.

Main Results:

  • Produced a haplotype-phased assembly (v4.0) with two haplotypes (HAP1: 571 Mbp, HAP2: 552 Mbp).
  • Assembly size is smaller than v2.0, with improved contiguity (N50s of 28.9 and 16.7 Mbp) and telomere capture.
  • Increased gene annotation completeness to 99.4%, identified numerous genes in tandem arrays, and characterized repeat elements.

Conclusions:

  • The v4.0 E. grandis genome assembly represents a significant improvement over v2.0.
  • This enhanced assembly provides a more accurate resource for understanding genome structure and variation.
  • The findings will accelerate the development of elite Eucalyptus breeding programs for sustainable forestry.