Diapause which enhances survival during unfavourable periods is one of the most common seasonal adaptations of insects. A typical 'diapause syndrome' includes an arrest of development (or of reproduction is the case of adult diapause), a decrease in metabolism, an increase in the resistance to adverse environmental conditions, an accumulation of reserves, etc. In contrast to quiescence, facultative diapause is an 'anticipatory response', that is it is induced by environmental cues before the beginning of the adverse sea
Background. Diapause is an important component of insect life cycle which ensures synchronization of reproduction and development with local seasonal climate. Genetic bases of this synchronization are particularly important for the analysis of biological invasions. Materials and methods. We investigated photoperiodic induction of diapause in hybrids between two populations of Harmonia axyridis (Pallas): autochthonous population from Irkutsk (Siberia) which shows a strong induction of diapause by short days and invasive population from Sochi (the Caucasus) which exhibits very weak photoperiodic induction of diapause. Results. Reciprocal crosses showed that the strong photoperiodic induction of diapause is dominant and the effects of male and female genotypes on progeny phenotype are equal.
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