Ds. Joshi, PSI-MUTATION AFFECTS PHASE-ANGLE DIFFERENCE, FREE-RUNNING PERIOD AND PHASE-SHIFTS IN AEDES KROMBEINI (STEGOMYIA), Biological rhythm research, 27(4), 1996, pp. 421-430
A new mutation, designated as psi-mutant, affecting the timing of the
circadian oviposition rhythm was discovered the in natural population
of Aedes krombeini. This mutation advanced the phase of the ovipositio
n median in an entraining light-dark cycle of 12:12 h by ca. 7.0 h and
shortened the free running period tau in constant darkness (DD) by ca
. 4.0 h. Early oviposition in psi-mutants was also observed when while
free-running in DD they were subjected to 24-h temperature cycles (29
degrees C for 12 h and 18 degrees C for 12 h). When the phase respons
e curves (PRCs) for light pulses against DD as background were measure
d, the PRC for the psi-mutant had large delaying phase shifts, whereas
, that of the wild strain had small delaying phase shifts.