{
  "id": 11255061,
  "title": "Consolidating species boundaries in the Fusarium oxysporum species complex based on genomic evidence",
  "url": "https://urgent.news/2026/10/01/consolidating-species-boundaries-in-the-fusarium-oxysporum-species",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-01T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.25.754427v1?rss=1"
  },
  "original_language": "en",
  "account": "The Fusarium oxysporum species complex (FOSC) is a group of plant pathogens that infect a variety of crops, causing significant economic and ecological issues. This complex has seen numerous species descriptions, but many of these names have been disputed due to the use of limited marker genes, inconsistent taxon sampling, and unstable species definitions. To tackle these issues, scientists conducted a comprehensive analysis of nearly 2,500 conserved marker genes from 660 genomes, including genome assemblies from 22 ex-type strains sequenced using long-read sequencing technology. This effort represents over half of the currently recognized 51 species within the FOSC.\n\nBy employing maximum likelihood and coalescence-based analyses on the full phylogenomic data matrix, as well as subsets, the researchers were able to construct a robust phylogeny of the FOSC. This phylogenetic tree was further supported by whole genome comparisons, demonstrating the reliability of the phylogenomic approach. The study found that many previously described species were actually redundant, and two novel lineages were identified that had not been previously documented. Crucially, the direct comparison of these results to traditional marker gene-based approaches highlighted the shortcomings of the latter method for species delimitation within the FOSC.\n\nThe phylogenomic framework developed in this study offers a more accurate and stable foundation for the taxonomy of the Fusarium oxysporum species complex. By providing a clear phylogenetic framework, it enables the detection of novel marker genes capable of distinguishing the major lineages within FOSC. This advancement is essential for future taxonomic work and classification efforts, ensuring a more accurate and reliable understanding of the relationships among these plant pathogens. The robust phylogenomic analyses presented in this study provide a critical resource for the broader research community, offering a stable cornerstone for revising the taxonomy of the FOSC and guiding future studies in this field.",
  "summary": "The Fusarium oxysporum species complex (FOSC) comprises numerous plant pathogens infecting crops such as tomato, lettuce, melon, and banana. Despite its economic and ecological importance and decades of research, the species names linked to different phylogenetic lineages within this species complex remain largely controversial. Earlier taxonomic frameworks relied on a limited number of marker…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}