A mutant strain of Chymomyza costata (Diptera: Drosophilidae) insensitive to diapause-inducing action of photoperiod

Authors

  • ARI J. RIIHIMAA,

    1. Institute of Low Temperature Science, Hokkaido University, Sapporo, and Zoological Institute, Faculty of Science, Hokkaido University, Sapporo, Japan
    2. *Department of Genetics, University of Oulu, SF-90570, Oulu 57, Finland.
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  • MASAHITO T. KIMURA

    Corresponding author
    1. Institute of Low Temperature Science, Hokkaido University, Sapporo, and Zoological Institute, Faculty of Science, Hokkaido University, Sapporo, Japan
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Zoological Institute, Faculty of Science, Hokkaido University, Sapporo, Hokkaido 060, Japan.

Abstract

ABSTRACT. From a Japanese population of Chymomyza costata which has been known to have a photoperiodic larval diapause, we selected a mutant strain which did not respond to photoperiod. However, about 70% of the individuals of this strain entered diapause at 11oC irrespective of photoperiod, and about the same percentage of those of the photoperiod-sensitive strain also did so in continuous illumination at 11oC. This indicates that low temperature induces diapause independently of photoperiod. On the other hand, a temperature drop from 18 or 25oC to 15oC and chilling at 4oC did not induce diapause.

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