Phase Shifts of Potassium Uptake Rhythm in Lemna gibba G3 Due to Light, Dark or Temperature Pulses

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Abstract
Phase shifts in potassium uptake rhythm during continuous light in flow medium (FMC) and static (STC) culture of Lemna gibba G3, produced by various light and temperature pulses were examined. The phase responses were very similar to those known for a variety of circadian rhythms: A pulse of high temperature (39°C) shifted the phase in the same way as a light pulse inserted during darkness. A pulse of darkness, or of low temperature (5 or 10°C), however, caused a phase shift that was the inverse of that caused by a light pulse. A temperature pulse of definite timing erased the rhythm. Although the rhythms in the STC and FMC had essentially the same phase response, a highintensity light pulse was more effective in FMC and dark and temperature pulses in STC.

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