抄録
Inheritance of cold hardiness and sugar contents were studied at the imaginal stage in Drosophila takahashii and D. lutescens. The latter species was more resistant to cold stress than the former. In D. lutescens, the cold hardiness improved by the low temperature acclimation at 5 or 10°C, but such effect of acclimation was not observed in D. takahashii. The F1 progeny between these two species showed the intermediate resistance between the parental species, and the backcross progeny showed the intermediate between F1 and the parental species. This suggests that their cold hardiness was controlled by a gene or genes mainly located on autosomal chromosomes.
The trehalose content was somewhat higher in D. lutescens than D. takahashii and the content increased as culturing temperature decreased in both species, but its role in the cold hardiness of these species was not clear.
