Light cycles given during development affect freerunning period of circadian locomotor rhythm of period mutants in Drosophila melanogaster

Kenji Tomioka, Kouzo Uwozumi, Nobutaka Matsumoto

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We reared wild type (Canton-S) and period mutant flies, i.e., per(S) and per(L), of Drosophila melanogaster in constant darkness, constant light or 24h light dark cycles with various light to dark ratios throughout the development from embryo to early adult. The locomotor activity rhythms of newly eclosed individuals were subsequently monitored in the lighting conditions, in which they had been reared, for several days and then in constant darkness. Circadian rhythms were clearly exhibited in constant darkness even in flies reared in constant light and constant darkness as well as flies reared in light-dark cycles, but the freerunning period differed among groups. The results suggest that the circadian clock is assembled without any cyclical photic information, and that the light influences the developing circadian clock of Drosophila to alter the freerunning period. The effects of light on the rhythm differed in some aspects between per(L) flies and the other two strains. Possible mechanisms through which light affects the developing circadian clock are discussed.

Original languageEnglish
Pages (from-to)297-305
Number of pages9
JournalJournal of Insect Physiology
Volume43
Issue number3
DOIs
Publication statusPublished - Aug 19 1997
Externally publishedYes

Keywords

  • Circadian rhythm
  • Development
  • Drosophila melanogaster period mutants
  • Photoperiod

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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