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Soybean cultivars show varying Sclerotinia sclerotiorum disease severity, but pathogen isolates do not differ in virulence. This suggests regional isolates are equivalent for evaluating soybean resistance to Sclerotinia stem rot.

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Area of Science:

  • Plant pathology
  • Genetics
  • Agronomy

Background:

  • Sclerotinia sclerotiorum causes Sclerotinia stem rot, a significant disease in Glycine max (soybean).
  • Understanding host-pathogen interactions is crucial for developing resistant soybean cultivars.
  • Pathogen variability can influence disease development and resistance strategies.

Purpose of the Study:

  • To investigate genetic interactions between soybean cultivars and Sclerotinia sclerotiorum isolates.
  • To determine if pathogen genetic background influences disease severity on different soybean cultivars.
  • To assess the utility of geographically diverse isolates for soybean resistance screening.

Main Methods:

  • Controlled inoculation of five Glycine max cultivars with four genetically distinct Sclerotinia sclerotiorum isolates.
  • Standardized inoculation using a straw method and incubation under continuous leaf wetness.
  • Disease severity assessment at one and two weeks post-inoculation.

Main Results:

  • Significant differences in disease severity were observed among soybean cultivars.
  • NK S08-80 exhibited the lowest disease severity across all tested pathogen isolates.
  • No significant differences in disease severity were found among the Sclerotinia sclerotiorum isolates, and no significant cultivar-isolate interactions were detected.

Conclusions:

  • The genetic fingerprint or geographical origin of Sclerotinia sclerotiorum isolates did not correlate with virulence on the tested soybean cultivars.
  • Soybean cultivars may not possess the genetic capacity to differentiate virulence among these Sclerotinia sclerotiorum isolates.
  • Isolates of Sclerotinia sclerotiorum from the same region can be considered equivalent for evaluating soybean resistance to Sclerotinia stem rot.