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| Titel: |
The development in time of amplitude and shape of the free-running circadian leaf movement in Oxalis regnellii |
| Auteur: |
Kumke, Jens M. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 13 (1982) nr. 2 pagina's 105-120 |
| Jaar: |
1982-05 |
| Inhoud: |
The circadian leaf movement in Oxalis regnelli has been investigated under the influence of continuous white light of different intensity between 50 to 2000 lux. The results obtained from the recordings can be summed up to the following statements: At dim light the development in time of the amplitude of movement shows an irregular decline characterized by a distinct but temporary attenuation. At dim light the shape of movement in the beginning is prevailed by the pronounced spreading movement but then changes to predominance of the folding movement. This change appears during the transient minimum of the amplitude. The development in time of amplitude and shape is compressed by bright light. Thus at high light intensities the folding movement remains during a few free-running periods. Appearance and position in time of the amplitude attenuation accompanied by the change of the shape are influenced by pretreatment. Transient amplitude attenuations are not caused by interference of the two circadian systems coinciding with their pulses of opposite direction, but they reflect the fading-out of one system succeeded by the other that produces amplitudes with still increasing size. Basing on these results, a theoretical model is presented that provides the existence of two antagonistic “factors”, i.e. the self-excitation of the systems and the damping influence of continuous light. These “factors” are described by exponential functions of different steepness. They determine the development in time of amplitude and shape of the free-running circadian oscillation. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 8 gevonden artikelen
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