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Mycopathologia

, Volume 116, Issue 2, pp 71–75 | Cite as

Transformation of sterigmatocystin and O-methylsterigmatocystin by aflatoxigenic and nonaflatoxigenic field isolates of the Aspergillus flavus group

  • María J. Pro
  • Miguel A. Moreno
  • Guillermo Suárez
Article

Abstract

Transformation of sterigmatocystin and O-methylsterigmatocystin (two metabolic aflatoxin precursors) to aflatoxins by aflatoxigenic and nonaflatoxigenic field isolates of Aspergillus flavus was studied. The 24 nonaflatoxigenic isolates investigated failed to transform both precursors. Among the 8 aflatoxin-producing isolates used, 7 transformed both precursors whereas the remaining failed to transform both. According to these results, the usefulness of the measurement of enzymatic activities related to aflatoxin production in understanding the true status of conflictive field isolates is discussed.

Key words

Transformation sterigmatocystin O-methylsterigmatocistin A. flavus field isolates 

Abbreviations

ST

sterigmatocystin

OMST

O-methylsterigmatocystin

AFB1

aflatoxin B1

AFB2

aflatoxin B2

AFG1

aflatoxin G1

AFG2

aflatoxin G2

GM

growth medium of Adye and Mateles

RM

replacement medium of Adye and Mateles

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • María J. Pro
    • 1
  • Miguel A. Moreno
    • 1
  • Guillermo Suárez
    • 1
  1. 1.Departamento de Patología Animal I (Sanidad Animal), Facultad de VeterinariaUniversidad ComplutenseMadridSpain

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