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Plant Physiology 51:1084-1088 (1973)
© 1973 American Society of Plant Biologists

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Articles

Quantifying Rhythmic Movements of Albizzia julibrissin Pinnules 1

Willard L. Koukkaria

Franz Halbergb

Solon A. Gordonc

a Department of Botany, University of Minnesota, Minneapolis, Minnesota 55455, b Department of Laboratory Medicine and Pathology, Chronobiology Laboratories, University of Minnesota, Minneapolis, Minnesota 55455, c Division of Biological and Medical Research, Argonne National Laboratory, Argonne, Illinois 60439

The cosinor technique, previously applied to studies of animal rhythms, is used to assess the circadian rhythm in pinnule movement of Albizzia julibrissin. The method provides a quantitative approach for studying rhythm properties of either intact or excised pinnules. Phase shifting in A. julibrissin, as compared to the usually slower phase shifts of various circadian phenomena in the insect, bird, and mammal, occurs within 1 day or two. Rhythm adjustment in the pinnules takes place more rapidly when the lighting regiment is advanced than when it is delayed.

1 This work was supported by a grant from the Graduate School, University of Minnesota to W.L.K.; by United States Public Health Service Grant 5-K6-GM-13,981 and National Aeronautics and Space Administration Grant NGR-24-005-006 to F.H.; and by the National Aeronautics and Space Administration Grant W-12792 and the United States Atomic Energy Commission to S.A.G.






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Copyright © 1973 by the American Society of Plant Biologists