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Appl. Environ. Microbiol., Apr 1996, 1182-1187, Vol 62, No. 4
Copyright © 1996, American Society for Microbiology

Duckling toxicity and the production of fumonisin and moniliformin by isolates in the A and E mating populations of Gibberella fujikuroi (Fusarium moniliforme)

JF Leslie, WF Marasas, GS Shephard, EW Sydenham, S Stockenstrom and PG Thiel
Department of Plant Pathology, Kansas State University, Manhattan 66506- 5502, USA.

Two biological species of Gibberella fujikuroi (A and F mating populations) share the Fusarium moniliforme anamorph. Twenty strains of each of these biological species were tested for the ability to produce fumonisins B1, B2, and B3 and moniliformin and for toxicity to 1-day- old ducklings. Most of the members of the A mating population (19 of 20 strains) produced more than 60 micrograms of total fumonisins per g, whereas only 3 of 20 members of the F mating population produced more than trace levels of these toxins and none produced more than 40 micrograms of total fumonisins per g. In addition, only 3 of 20 members of the A mating population produced more than 1 microgram of moniliformin per g (and none produced more than 175 micrograms/g), while all 20 strains of the F mating population produced more than 85 micrograms of this toxin per g and 1 strain produced 10,345 micrograms/g. The duckling toxicity profiles of the strains of the two mating populations were similar, however, and the level of either toxin by itself was not strongly correlated with duckling toxicity. On the basis of our data we think that it is likely that the members of both of these mating populations produce additional toxins that have yet to be chemically identified. These toxins may act singly or synergistically with other compounds to induce the observed duckling toxicity.

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