Circadian Rhythms and Plant Photoperiodism

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Abstract
Endogenous circadian rhythms are demonstrated when Biloxi soybean is exposed to: (1) a very long dark period interrupted with brief periods of illumination, (2) various cycles, each cycle length being determined primarily by the length of the dark period. Pharbitis nil is an extremely sensitive short day plant and responds to a single long dark period. When Pharbitis plants are exposed to continuous light before a long dark period, there is no indication to show the participation of an endogenous rhythm in the photoperiodic response. However, if the plants are pretreated with a light-dark regime, they show a rhythmic response to increasing lengths of dark period. It is suggested that a light-on signal initiates some endogenous rhythm which affects the photoperiodic response.

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