The water relations of three isolates representative of each of the closely related species Aspergillus fiavus, A. nomius, A. oryzae and A. parasiticus were examined at three temperatures, 25°C, 30°C and 37°C. Media were prepared over a wide range of water
activity (aw) from 0.996 to 0.75, controlled by a mixture of glucose and fructose. Water relations of A. fiavus, A. oryzae and A. parasiticus were very similar. The minimum aw for germination and growth of each of these three species was 0.82 at 25°C,
0.81 at 30°C and 0.80 at 37°C. A. nomius was slightly less xerophilic, with minimum aw values for germination and growth of 0.83 at 25 and 30°C, and 0.81 at 37°C. Reported differences in water relations between A. fiavus and A. parasiticus were
not substantiated. The "domestication" of A. oryzae has not affected its water relations.
CSIRO Division of Food Science and Technology, North Ryde, N.S.W 2113, Australia
Publication date: January 1, 1995
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