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Updated: Oct 15, 2025

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Dead-End Hybridization in Walnut Trees Revealed by Large-Scale Genomic Sequence Data.

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Summary

Chinese walnut (Juglans hopeiensis) originated 370,000 years ago from Persian walnut (J. regia) and Asian butternuts. Despite distinct traits, these first-generation hybrids are genetic dead-ends, not progressing toward speciation.

Keywords:
chromosomal rearrangementsgene flowhybridizationpostzygotic reproductive barriersspeciationwalnuts

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Botany

Background:

  • Hybridization is a significant driver of speciation.
  • However, some hybrid lineages fail to reproduce, becoming evolutionary dead-ends.
  • Juglans hopeiensis, a distinct Chinese walnut, is suspected to be of hybrid origin.

Purpose of the Study:

  • To investigate the origin and reproductive status of Juglans hopeiensis.
  • To determine the parental species and timing of hybridization.
  • To identify potential genetic barriers to speciation in this hybrid.

Main Methods:

  • Whole-genome sequencing of 151 individuals from relevant walnut taxa.
  • Phylogenomic analysis to infer hybridization events and timing.
  • Identification of genomic regions associated with reproductive barriers.

Main Results:

  • All Juglans hopeiensis individuals are first-generation hybrids.
  • Gene flow onset estimated at 370,000 years ago, indicating early presence of J. regia in China.
  • Six inversion regions, rich in pollen-related genes, may cause postzygotic reproductive barriers.

Conclusions:

  • Juglans hopeiensis is a long-established hybrid that has not undergone speciation.
  • Postzygotic barriers, potentially linked to specific genomic inversions, prevent sexual reproduction in these hybrids.
  • This hybrid lineage represents a stable, non-speciating evolutionary dead-end.