Bright photophase accelerates re-entrainment after experimental jetlag in Drosophila.
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.
Center for Biological Rhythm Research, Ahmednagar College, Ahmednagar, 414001, MS, India.
Boynao
B
Sinam
Shweta
S
Sharma
Pooja
P
Thakurdas
Dilip S
DS
Joshi
D000818:Animals; D002940:Circadian Rhythm / Q000502:physiology*; D004330:Drosophila / Q000502:physiology* / Q000528:radiation effects*; D008027:Light; D009043:Motor Activity / Q000502:physiology; D017440:Photoperiod