[Dynamics of heat shock puffs in highly-inbred strains and heterosis hybrids of Drosophila melanogaster].

This study is aimed at elucidating the mechanisms of high heat resistance of heterosis hybrids. For this purpose, the dynamics of heat shock puffs of the high-inbred HA and BA lines as well as the HAxBA heterosis hybrids has been studied. Inadaptive properties of the HA line were observed to be expressed at the organism and cell levels, which is reflected by later induction of heat shock puffs. In the hybrids, these puffs occur considerably quicker, when heated, than with the high-inbred lines. Our conclusion is that the dynamics peculiarities of heat shock puffs reflect the differences in line and hybrid heat resistance. The higher heat resistance of the hybrid manifests itself in an earlier induction of heat shock puffs.