Atoxigenic Aspergillus flavus Competitively Reduce Aflatoxin Production by the Toxigenic Aspergillus flavus
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Abstract:
Six Aspergillus flavus isolates were collected from Guangdong, Shandong, Liaoning and Hubei Provinces in China, and identified through morphology and molecular biology. The aflatoxin production ability of these isolates was detected by HPLC. The results showed that GZ-6 was a toxigenic isolate, while GZ-15, WF-5, WF-20, JZ-2 and YC-8 were atoxigenic. To analyze the inhibitory effect of the atoxigenic strain on the toxigenic strain, the atoxigenic strain with the toxigenic strain were co-inoculated at t he spore concentration ratio of 104:105 or 105:105 on peanuts and maize, respectively. The results showed that the inhibitory effect of the atoxigenic strain on the toxigenic strain was significantly enhanced as the spore concentration increased. At the ratio of 105:105 (atoxigenic: toxigenic), the five atoxigenic A. flavus reduced 34.55~75.94% aflatoxin production by GZ-6 on maize and 38.03% ~83.03% aflatoxin production by GZ-6 on peanuts. WF-5, WF-20 and GZ-15 could prevent more than 75.00% aflatoxin production by GZ-6 and could probably be exploited as effective agents for aflatoxin control in field.
