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Plant Physiology 58:417-420 (1976)
© 1976 American Society of Plant Biologists

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Articles

Circadian Rhythmicity in Excised Samanea Pulvini

I. Sucrose-White Light Interactions 1

Esther Simon2, Ruth L. Satter and Arthur W. Galston

a Department of Biology, Yale University, New Haven, Connecticut 06520

The rhythmic movement of excised Samanea saman pulvini incubated in H2O or 50 mM sucrose was monitored during extended periods of white light (cool white fluorescent, 2,000 ft-c), darkness, or alternating white light (16 hr) and darkness (8 hr). In continuous white light, the rhythm damps at an intermediate angle after only one cycle, whether pulvini are incubated in sucrose or H2O. The rhythm also damps after the first cycle when darkened pulvini are incubated in H2O, but it persists for several cycles if sucrose is available. Sucrose depresses the mesor (average angle) during extended dark periods in Samanea, as in Albizzia julibrissin, but it increases the mesor if supplied during white light-dark cycles. With the latter irradiation schedule, oscillations persist for several cycles whether pulvini are supplied with H2O or sucrose, but closure is incomplete when pulvini are incubated in sucrose.

2 Present address: Departamento de Fisiología Vegetal, Facultad de Ciencias, Universidad de Barcelona, Barcelona, Spain.

1 This work was supported by a grant from the Spanish Ministerio de Educación y Ciencia to E. S. and by National Science Foundation Grant BMS74-24269 to R. L. S. and A. W. G.




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T. L. Hennessey and C. B. Field
Evidence of Multiple Circadian Oscillators in Bean Plants
J Biol Rhythms, July 1, 1992; 7(2): 105 - 113.
[Abstract] [PDF]


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Copyright © 1976 by the American Society of Plant Biologists