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| Titel: |
Self-excitation of leaf movements in Oxalis regnellii under different light qualities |
| Auteur: |
Kumke, Jens M. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 16 (1985) nr. 2 pagina's 93-106 |
| Jaar: |
1985-06 |
| Inhoud: |
Self-excitation of leaf movements in Oxalis regnellii was studied under the influence of different constant conditions as darkness or irradiation of red or far-red. Since in Oxalis two oscillating systems have to be regarded to, attention was focussed upon the development in time of self-excitation of both systems. Similar to previous findings under dim white light the self-excitation of the spreading system preceeds the foldings system in time in all cases. A behavioral difference as response to red and far-red could be found in the rate of self-excitation. While under the influence of continuous red light maximal amplitudes are reached within three free-running periods, under far-red this effect needs only one period. In connection to this result, the deceleration of leaf closure caused by far-red (well-known from experiments in legumes, and now also observed in Oxalis), can be shown to reflect the interference of two antagonistic effects. Since self-excitation starts rapidly under far-red and generally begins with the excitation of the spreading movement, nastic closure can be compensated by the first free-running spike of the spreading system. In addition, a computer program is presented to simulate amplitude-dips and phase-shifts caused by antagonistic effects of two locally separated systems. In this program each oscillator activity is implied to perform a steep spike with following slow decline (collision function). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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