Identification of Osmophilic Aspergillus Isolated from Rice and Their Radio-sensitivity

Osmophilic Aspergillus responsible for spoilage of rice, corn, milo and wheat have been isolated and identified. Fifteen strains were classified as members of the Aspergillus glaucus group, and were subdivided into A. ruber, A. repens, A. mangini, A. chevalieri and A. montevidensis. Nine strains were classified as members of the A. restrictus group, and were subdivided into A. gracilis, A. vitricolae and A. casiellus. The other 7 strains were classified as A. versicolor in the A. versicolor group, A. sulphureus in the A. ochraceus group, and A. niveus in the A. flavipes group.

All of dose-survival curves obtained with the conidia of 10 strains showed the sigmoidal type having the D₁₀ values between 18 and 30 krad. The survival curves obtained with the ascospores of A. glaucus group also showed the sigmoidal type having the D₁₀ values of 54 krad. Radio-sensitivity of the dry conidia was similar to that of the dry ascospores, having D₁₀ values between 50 to 58 krad.