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Karyotype evolution in Fusarium.

Cees Waalwijk1, Masatoki Taga2, Song-Lin Zheng2

  • 1Businessunit Biointeractions & Plant Health, Wageningen Plant Research, P.O. Box 16, 6700AA, Wageningen, The Netherlands.

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|July 19, 2018
PubMed
Summary
This summary is machine-generated.

Karyotype analysis of 33 Fusarium species reveals chromosome number reduction in derived lineages. This study provides valuable chromosome number data for future whole-genome assembly of Fusarium species.

Keywords:
NORRPB1RPB2accessorychromosomegenomepathogenphylogenyqPCRsupernumerary

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Area of Science:

  • Mycology
  • Genetics
  • Evolutionary Biology

Background:

  • The genus *Fusarium* encompasses diverse fungal species with significant agricultural and pathogenic impacts.
  • Understanding the karyotypic diversity and evolution within *Fusarium* is crucial for species identification and phylogenetic analysis.

Purpose of the Study:

  • To investigate the karyotype diversity across 33 *Fusarium* species representing 11 species complexes.
  • To elucidate the evolutionary trends in chromosome number (CN) and the role of nucleolar organizing regions (NORs).

Main Methods:

  • Germ tube burst method (GTBM) for karyotype analysis.
  • Quantitative real-time PCR and genome sequence analysis to investigate chromosome number variations.

Main Results:

  • Nucleolar organizing regions (NORs) were predominantly telomeric.
  • Variable karyotypes were observed in eight species, with significant variation in core chromosome number (CN) in *F. solani* and *F. buharicum* complexes.
  • A trend of core CN reduction was identified in derived *Fusarium* lineages, particularly within the *sambucinum* species complex, with a potential fixed core CN of 4 in the *F. graminearum* subclade.

Conclusions:

  • Karyotype evolution in *Fusarium* is characterized by a reduction in core CN in certain lineages.
  • The study provides foundational karyotype data crucial for future whole-genome sequencing and assembly efforts in *Fusarium*.
  • The findings contribute to a deeper understanding of *Fusarium* phylogeny and genome organization.