(Morphological characters and physiological properties of aflatoxin B sub(1) producing or non-producing strains of Aspergillus flavus).

Comparison between about 80 strains of Aspergillus flavus , belonging to the series of flavus and oryzae , obtained from international collections but also isolated from French or African substrates revealed the following observations: 1. Cultural and morphological characteristics of toxicogenic and...

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Bibliographic Details
Published in:Mycopathologia (1975) 1985-01, Vol.91 (3), p.181-186
Main Authors: Kogbo, W, Lemarinier, S, Boutibonnes, P
Format: Article
Language:Italian
Subjects:
Aspergillus flavus
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Summary:Comparison between about 80 strains of Aspergillus flavus , belonging to the series of flavus and oryzae , obtained from international collections but also isolated from French or African substrates revealed the following observations: 1. Cultural and morphological characteristics of toxicogenic and atoxicogenic strains of A. flavus are similar. However, the former produce a diffusible yellow pigment in 83% of isolates. 2. The two groups of conidiospores have the same resistance to UV irradiation (254 nm, 5 and 10 min). All the strains are equally sensitive to 4 antifungal antibiotics: nystatine, ketoconazole, clotrimazole and amphotericine. 3. A difference was seen in the capacity to produce enzymes as alpha -galactosidase, beta -galactosidase and beta -glucosidase, implicated in the glucid metabolism. The specific hydrolytic activity has been confirmed by the characterization of a large amount of beta -galactosidase and by a diauxic growth on glucose medium supplemented by lactose.
ISSN:0301-486X