Study on pectinase and sclerotium producing abilities of two kinds ofAspergillus flavus isolates from Zhejiang |
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Authors: | Dr Zhi-Gang Wang Zhe Tong Su-Yun Cheng Li-Ming Cong |
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Affiliation: | (1) Zhejiang Institute of Food Safety Control and Inspection, 17 Laozhedazhi Road, Qingchum Street, 310009 Hangzhou, P.R. China |
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Abstract: | Pectinase and sclerotium production by strains ofAspergillus flavus were determined with a pectinase culture plate assay and a Cz 3% NaNO3 medium plate assay. In theA. flavus population, 51% of isolates produced sclerotia, the toxigenic strains showing a tendency to have smaller sclerotia. Strains producing both abundant small sclerotia and a large quantity of aflatoxin were not found. There was no linear correlation between the amount of aflatoxin produced and the number of sclerotia. Levels of pectinase produced by the toxigenic strains were higher than that of the non-toxigenic strains, and this character was more obvious in the sclerotium-producing strains than in the non-sclerotium-prodcing strains. In theA. flavus population from Zhejiang in which the toxigenic strain rate was low, toxigenic strains may require higher levels of pectinase to compete with the non-toxigenic strains when infecting foodstuffs. |
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Keywords: | Aflatoxin-producing Aspergillus flavus Pectinase-producing Sclerotium-producing |
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