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Breakdown of selection-mediated correlation between development time and clock period.

Pankaj Yadav1, Vijay Kumar Sharma1

  • 1Chronobiology Laboratory, Evolutionary and Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, P.O. Box 6436, Jakkur, Bangalore 560064, Karnataka, India.

Physiology & Behavior
|February 20, 2014
PubMed
Summary
This summary is machine-generated.

Environmental cycles alter fruit fly circadian rhythms. Faster developing flies showed reduced differences in clock period (τ) under light/dark and warm/cold cycles, suggesting environmental modulation of development time and τ correlation.

Keywords:
After-effectsCircadian rhythmsDrosophilaLight/dark cyclesThermophase/Cryophase cyclesWarm/cold cycles

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Area of Science:

  • Chronobiology
  • Animal Behavior
  • Genetics

Background:

  • Previous research linked faster pre-adult development in fruit flies to a shortened circadian clock period (τ).
  • Circadian period (τ) is known to be influenced by environmental light/dark (LD) cycles.

Purpose of the Study:

  • To investigate if the correlation between development time and τ persists in faster developing (FD) and control (BD) fruit flies under various cyclic conditions.
  • To examine how different light/dark and warm/cold cycles affect the circadian period (τ) and the difference between FD and BD flies.

Main Methods:

  • Assayed activity/rest behavior of FD and BD flies under constant darkness (DD).
  • Exposed flies to week-long cycles: LD (10:10, 12:12, 14:14h), varying light intensities, warm/cold (WC) cycles (WC1, WC2), and combined LD/WC cycles.

Main Results:

  • Both LD and WC cycles altered the τ of FD and BD flies, significantly reducing the difference between the stocks.
  • LD10:10 cycles had more pronounced after-effects on τ than LD12:12 and LD14:14.
  • WC1 cycles (higher contrast) shortened the period; combined LD/WC cycles showed complex effects, with WC2/LD causing the most drastic τ reduction.

Conclusions:

  • Environmental cyclic conditions modulate the circadian organization of Drosophila melanogaster.
  • The selection-mediated correlation between pre-adult development time and circadian clock period (τ) is altered by environmental factors.