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  • Title: Distribution of aflatoxin-producing Aspergillus flavus and Aspergillus parasiticus in sugarcane fields in the southernmost islands of Japan.
    Author: Takahashi H, Kamimura H, Ichinoe M.
    Journal: J Food Prot; 2004 Jan; 67(1):90-5. PubMed ID: 14717357.
    Abstract:
    The distribution of Aspergillus flavus and Aspergillus parasiticus in sugarcane field soils and on harvested sugarcane stems was studied on seven islands of Okinawa and Kagoshima Prefectures, the southernmost prefectures in Japan. With the use of a combination of dilution plate and plant debris plate techniques, the fungi were detected on all seven islands studied and in 74% of 53 soil samples. The fungi were also found on the cut surfaces of sugarcane stems from one of the islands. A. parasiticus was the predominant fungus, although many atypical A. parasiticus isolates that produced metulated conidial heads were also obtained. The proportions of isolates testing positive for aflatoxin production were ca. 89% (146 of 164) of all isolates and ca. 69% of A. flavus isolates. More than 40% of A. flavus isolates also produced G aflatoxins. Scanning electron microscopic observation of conidial wall texture was useful in distinguishing A. parasiticus from A. flavus. Cyclopiazonic acid, an indole mycotoxin, was never synthesized by any of the A. parasiticus or G aflatoxin-producing A. flavus isolates tested.
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