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A Stachybotrys chartarum isolate from soybean.

Shuxian Li1, Glen L Hartman, Bruce B Jarvis

  • 1National Soybean Research Center, Department of Crop Sciences, University of Illinois, Urbana 61801, USA. sli1@uiuc.edu

Mycopathologia
|June 4, 2002
PubMed
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Stachybotrys chartarum, a fungus not previously known to affect soybeans, was isolated from soybean root lesions. This study confirmed its identity and pathogenicity using multiple methods, including molecular analysis.

Area of Science:

  • Mycology
  • Plant Pathology
  • Molecular Biology

Background:

  • Fungi associated with soybean roots are under investigation.
  • Stachybotrys chartarum was isolated from soybean root lesions, a novel finding.
  • The pathogenicity and identity of this isolate required thorough characterization.

Purpose of the Study:

  • To identify and characterize a Stachybotrys chartarum isolate from soybean root lesions.
  • To confirm the pathogenicity of this fungal isolate on soybean plants.
  • To determine the genetic and biochemical profile of the soybean-associated Stachybotrys chartarum.

Main Methods:

  • Fungal morphology was examined using light and environmental scanning electron microscopy.
  • Pathogenicity tests were conducted by inoculating soybean seeds with colonized sorghum grain.

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  • Biochemical analysis (mycotoxin production) and molecular identification (PCR, ITS sequencing) were performed.

    • Main Results:

    • The isolate exhibited characteristic Stachybotrys chartarum morphology and produced satratoxins G and H, roridin L-2, and other mycotoxins.
    • Inoculation resulted in soybean root lesions, and the fungus was reisolated.
    • Molecular analysis confirmed the isolate as Stachybotrys chartarum with high sequence identity to known strains.

    Conclusions:

    • Stachybotrys chartarum is confirmed as a causal agent of soybean root lesions.
    • This study provides comprehensive biological, chemical, and molecular data for this soybean-associated fungus.
    • The findings expand the known host range and pathogenic potential of Stachybotrys chartarum.