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Population Genomics Reveals Population Structure and Mating-Type Loci in Marssonina brunnea

Qiang Cheng1, Hougang Yang1, Junxiang Chen1

  • 1Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.

Journal of Fungi (Basel, Switzerland)
|June 23, 2022
PubMed

Insights

Marssonina brunnea, a poplar tree pathogen, exhibits distinct genetic populations and high recombination rates in its multigermtubi form. This indicates significant evolutionary potential, posing a threat to poplar plantations.

Area of Science:

  • Plant Pathology
  • Mycology
  • Genomics

Background:

  • Marssonina brunnea is a significant fungal pathogen affecting poplar trees.
  • Understanding its genetic diversity and evolutionary mechanisms is crucial for disease management.

Purpose of the Study:

  • To investigate the genetic diversity and population structure of Marssonina brunnea f.sp. multigermtubi (MbMu) and Marssonina brunnea f.sp. monogermtubi (MbMo).
  • To analyze the recombination patterns and mating system of MbMu isolates.

Main Methods:

  • Genome resequencing of 35 M. brunnea isolates (32 MbMu, 3 MbMo).
  • Single Nucleotide Polymorphism (SNP) annotation and analysis.
  • Population genetic analyses including structure, principal component analysis, neighbor-net, and homoplasy index tests.
  • Investigation of MAT loci architecture.

Main Results:

  • MbMu and MbMo represent two distinct genetic populations.
  • MbMu population exhibits a high frequency of recombination and a heterothallic mating system.
  • A significant proportion of genes in MbMu show potentially functional SNPs.
  • No subpopulation structure was detected within MbMu.

Conclusions:

  • The MbMu population possesses high evolutionary potential due to diverse functional variants and high recombination rates.
  • This evolutionary capacity poses a significant threat to poplar plantations.
  • The findings provide insights into the population genetics and evolution of M. brunnea.
Keywords:
Marssonina brunneagenome resequencingmating-type locuspopulation structure

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