Study on distribution of myco toxin producing fungi part 4 myco toxin producing ability of aspergillus strains inhabited in southeast asia
Manabe, M.; Tsuruta, O.; Goto, T.; Matsuura, S.
Report of National Food Research Institute 33: 49-56
Mycotoxin-producing ability of A. strains isolated from 62 soil samples and 36 grain or other food samples collected from Southeast Asian countries including Philippines, Thailand and Indonesia was examined. Aflatoxin productivity was examined on the isolated strains of A. flavus, A. parasiticus and A. tamarii. Sterigmatocystin productivity, on A. versicolor and A. nidulans; and ochratoxin, on A. ochraceus. Forty out of 84 strains of A. flavus showed aflatoxin productivity on rice culture containing Zn ion. The A. parasiticus strain that is the only one isolated from the all collected samples showed the aflatoxin productivity. None of 37 A. tamarii strains produced any aflatoxins. Aflatoxin-producing fungi were isolated from about 30% of all the collected samples. Aflatoxin-producing fungi were being widely distributed in the Southeast Asian area on the tropical zone. Fifteen out of 16 A. versicolor and A. nidulans strains showed sterigmatocystin productivity on rice culture containing polypepton. Sterigmatocystin-producing fungi were isolated from 7% of all the collected samples. This result is the same as what was previously reported in relation to the distribution of sterigmatocystin-producing fungi in Japan. All of 5 strains of A. ochraceus isolated from the samples showed ochratoxin A productivity on rice culture. Ochratoxin-producing fungi were isolated from a little more that 5% of all the collected samples.