[Properties of inbred Drosophila melanogaster lines obtained from a population selected for an increased rate of embryonic development].
Two heterogeneous Drosophila melanogaster populations were subjected to selection for an increased rate of embryonic development by picking out the first 10% of hatching larvae. After repeating this procedure in 15 generations, "fast" populations were obtained, in which the duration of embryonic development at high temperature (31-32 degrees C) was 30-40 min less than in nonselected control populations. The results of preliminary experiments on substituting the second and third chromosomes in the selected and control populations provide evidence that selected genes responsible for accelerated development are located on the second chromosome. Inbreeding in 12 generations of selected populations was used to obtain about 40 lines homozygous, in particular, at the alcohol dehydrogenase gene. In four lines, the developmental rate was higher than in a homozygous control line, but others did not differ from control or developed more slowly. The duration of embryonic development at 32 degrees C in fast lines was 50-70 min shorter than in control, but this difference was significantly less at lower temperatures (25 and 17 degrees C). Hence, high temperature is primarily a factor in providing conditions for the expression of genes determining the developmental rate, rather than a factor of selection for these genes. It is suggested that selected genes modify developmental rate dependence on temperature.
Neĭfakh
A A
AA
Minin
A A
AA
Ozerova
S G
SG
Abramova
N A
NA
D000818:Animals; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics*; D004625:Embryo, Nonmammalian / Q000502:physiology; D007178:Inbreeding; D012641:Selection, Genetic; D013045:Species Specificity; D013696:Temperature