Проявление эффекта гетерозиса у межлинейных гибридов Drosophila melanogaster Mg. (Diptera: Drosophilidae) в реакции на действие экстремальных температур

Abstract

The reactions of high-inbred selected lines and inter-line hybrid of Drosophila melanogaster Mg. to extreme temperatures have been subjected to a comparative study at organism and cell levels. The heat resistance of the imago, the electronegativity of cell nuclei in larval salivary glands, and thermolability of the latter parameter in lines with marginal adaptive characters have been determined and found to be different. It was established that the higher-adaptivity line has higher values of these parameters than the lower-adaptivity line, and that F1 hybrids have higher values than both parents. The hybrids were also observed to have shorter average recovery period from cold stress than the high-inbred lines. On the basis of both our experimental data and evidences of other studies, it is concluded that the observed differences between hybrids and inbreeds may be explained by certain heterogeneities in their nuclear structure and energetics.