Intraspecific variations in the rhythmic (circadian) leaf movements in soybean (Glycine maxL. Merr) were investigated. Results indicated (1) that whereas there was no significant difference in the free-running periods in continuous darkness among the various cultivars tested, there was a significant difference in the response of the free-running rhythms to continuous light; (2) that there was a difference in the phase shifts to single light pulses among the cultivars. (The assumption that the response of the rhythms to continuous light is related functionally to the phase response to single light pulses was examined using the concept of the velocity response curve); and (3) that there was a significant difference in the stability (accuracy) of the rhythms of the cultivars which is related to their photoperiodic sensitivity.
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