, Volume 99, Issue 7, pp 575–578 | Cite as

Bright photophase accelerates re-entrainment after experimental jetlag in Drosophila

  • Boynao Sinam
  • Shweta Sharma
  • Pooja Thakurdas
  • Dilip S. JoshiEmail author
Short Communication


The efficacy of bright photophase (BP) in accelerating the re-entrainment of Drosophila biarmipes rhythm following 8 h phase advance and delay of light–dark (LD) cycle was examined by subjecting the flies to 24 h LD cycles with dim photophase (DP) at 30 lx and BP at 300 lx. Re-entrainment was analysed by using the activity onset, activity offset and the duration of activity. Following LD advance or delay, the BP flies re-entrained faster than the DP flies which was attributed to the enhanced zeitgeber strength of BP. Nevertheless, the re-entrainment was a protracted process even in the BP flies since the activity offsets underwent more transients than the activity onsets. Thus, this study demonstrates that the BP accelerates the re-entrainment in D. biarmipes. It, however, also reveals that the re-entrainment is a prolonged process when the activity onset and offset are regarded as the rhythm markers.


Drosophila Jetlag Re-entrainment Transients 



The study was supported by the Research Grant No. FIST SR/SO/AS-MS01/2009 funded by DST, New Delhi. The authors thank three anonymous reviewers for their constructive comments on the previous version of manuscript.


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Boynao Sinam
    • 1
  • Shweta Sharma
    • 1
  • Pooja Thakurdas
    • 1
  • Dilip S. Joshi
    • 1
    Email author
  1. 1.Center for Biological Rhythm Research, Ahmednagar CollegeAhmednagarIndia

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