抄録
In this paper, the influences of incubation temperature on the production of earthy-musty odour substances and their growth were investigated using three Actinomycetes ; Streptomyces griseofuscus Mikawa A strain, S. griseofuscus IFO 12870 strain and S. resistomyciticus var. Biwako B strain. In the temperature range of 20-37°C Mikawa A strain produced continuously a large amount of 2-methylisoborneol (2-MIB) and geosmin at lower temperature. On the other hand S. griseofuscus IFO 12870 strain produced abundantly 2-MIB and geosmin at both low and high temperatures. S. resistomyciticus var. Biwako B strain produced a small amount of both substances compared with Mikawa A strain and IFO 12870 strain, but the effect of incubation temperature was small. The optimum temperature for the Actinomycete growth by M agar plate culture was higher for IFO 12870 strain and Biwako B strain than for Mikawa A strain. When using liquid culture it was higher for Mikawa A strain and IFO 12870 strain than for Biwako B strain. These results suggest that the amount of biosynthesis of protein enzymes related to earthymusty odour production is dependent on the incubation temperature like many other antibiotics. The optimum temperature for the earthy-musty odour production is lower than the optimum temperature for their growth. The optimum temperatures for several earthy-musty odour productions are not always the same even for the same kind of germs collected from different plates.
