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Annals of Botany 37: 1027-1034, 1973
© 1973 Annals of Botany Company

RESEARCH-ARTICLE

Some Observations on a Circadian Rhythm in Carbon Dioxide Compensation in Bryophyllum fedtschenkoi

M. B. JONES1

Department of Biological Sciences, University of Lancaster U.K.

Received: 14 September 1972   

Detached shoots of Bryophyllum fedtschenkoi maintained in continuous light and at a constant temperature exhibit a circadian rhythm in CO2 compensation. The rhythm has a period of 21.6±0.1 h at 23 °C and its phase can be set and shifted by suitable treatments. These observations suggest that the ryhthm is truly endogenous in nature.

The phase is set by a light-on stimulus, or a drop in light intensity. Phase shift can be induced by short periods (3 h) of reduced light intensity as well as similar periods of darkness given during the day phase of the rhythm. A change from white light to the same number of incident quanta of monochromatic light of 450 nm (blue), 550 nm (green), or 652 nm (red) always shifted the phase, but the degree of shift was less in red light than in blue or green. The plant reacted to achange to blue or green light as though it had been placed in the dark. Althbugh red light was apparently ‘recognized’, the change from white to red was still sufficient to alter the phase of the rhythm.

The possible role of phosphoenolpyruvate carboxylase activity in controlling the rhythm is discussed.


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