Ecological study on mycotoxin contamination by mycotoxin-producing fungi
2018
Takahashi, H. (National Institute of Health Sciences, Kawasaki city, Kanagawa Prefecture (Japan). Division of Microbiology)
1) The distribution of fungal mycelium and mycotoxins such as sterigmatocystin, aflatoxin, citrinin in individual brown rice kernels were studied. The mycotoxin was found near the invading mycelium of the mycotoxin-producing fungi, which was principally present around germ. The mycotoxin originally presented in moldy brown rice decreased during milling but was not completely removed from highly damaged kernels. 2) The distribution of aflatoxin-producing fungi in soil of sugarcane fields and on harvested sugarcane stem of the seven of the Southernmost islands were investigated. Atypical types of A. paraisiticus and A. flavus tentatively identified in morphology were detected. Molecular study cleraly showed atypical A. parasiticus was classified as a intermediate of new genotype between A. parasiticus and A. flavus and atypical A. flavus was as atypical type of A. nomius. Recent report demonstrated new type of A. parasiticus distributed in the sugarcane field of South Texas, USA. Sugarcane cultivation has attributed the biodiversty of aflatoxin-producing fungi in the fields.
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