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A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
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A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates

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Are formae speciales pathogens really host specific? A broadened host specificity in Fusarium oxysporum f.sp.

Daniel Mawuena Afordoanyi1,2, Roderic Gilles Claret Diabankana3, Yaw Abayie Akosah4

  • 1Laboratory of Molecular Genetics and Microbiological Methods, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russia.

Brazilian Journal of Microbiology : [Publication of the Brazilian Society for Microbiology]
|July 16, 2022
PubMed

Insights

This study reports the first observation of altered host specificity in Fusarium oxysporum. Clonal derivatives of a cucumber pathogen broadened their host range to include tomato, while retaining cucumber infectivity.

Area of Science:

  • Plant Pathology
  • Microbial Genetics
  • Molecular Plant-Microbe Interactions

Background:

  • Fusarium oxysporum strains exhibit distinct host specificity, forming the basis of the forma specialis system.
  • This host specificity is generally considered a stable trait in these phytopathogenic fungi.

Purpose of the Study:

  • To investigate and report changes in host specificity within Fusarium oxysporum.
  • To characterize the altered pathogenicity of a specific strain, F. oxysporum f.sp. radicis-cucumerinum V03-2 g (Forc V03-2 g).

Main Methods:

  • Isolation and culturing of clonal derivatives from the original Forc V03-2 g strain.
  • Pathogenicity assays on host plants (cucumber and tomato) to assess infectivity.

Main Results:

  • Clonal derivatives of Forc V03-2 g acquired the ability to infect tomato plants.
  • These altered strains maintained their capacity to infect the original host, cucumber.
  • This represents a broadening of host specificity, not a complete shift.

Conclusions:

  • This is the first documented instance of altered pathogenicity and broadened host specificity in Fusarium oxysporum formae speciales.
  • The developed clonal derivatives offer a valuable tool for studying the genetic factors governing host specificity in F. oxysporum.
  • Understanding these genetic determinants is crucial for managing Fusarium wilt diseases.
Keywords:
Forma specialisFusarium oxysporumHost specificityRoot rotTomato

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