Response of the Rhythmic Leaf Movements of Soybean (Glycine max L. Merr) to the Light Intensity of Light/Dark Cycles

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Abstract
The rhythmic (circadian) leaf movements of soybean were entrained to various light/dark cycles. The phase relation of the rhythm to light/dark cycles varied depending on the light/dark schedules. The light intensity in the light periods, however, had no effect on the phase relation although the light intensity in continuous light schedules had a strong effect on the free-running period. Leaf movements also were controlled by a non-circadian factor which occasionally affect the lowest leaf position that is usually taken as a phase reference point of rhythmic leaf movement.

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