Plant Physiology 96:831-836 (1991)
© 1991 American Society of Plant Biologists
Environmental and Stress Physiology
Circadian Rhythms in Photosynthesis 1
Oscillations in Carbon Assimilation and Stomatal Conductance under Constant Conditions
Timothy L. Hennessey and
Christopher B. Field
Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305,
Department of Biological Sciences, Stanford University, Stanford, California 94305
Net carbon assimilation and stomatal conductance to water vapor oscillated repeatedly in red kidney bean, Phaseolus vulgaris L., plants transferred from a natural photoperiod to constant light. In a gas exchange system with automatic regulation of selected environmental and physiological variables, assimilation and conductance oscillated with a free-running period of approximately 24.5 hours. The rhythms in carbon assimilation and stomatal conductance were closely coupled and persisted for more than a week under constant conditions. A rhythm in assimilation occurred when either ambient or intercellular CO2 partial pressure was held constant, demonstrating that the rhythm in assimilation was not entirely the result of stomatal effects on CO2 diffusion. Rhythms in assimilation and conductance were not expressed in plants grown under constant light at a constant temperature, demonstrating that the rhythms did not occur spontaneously but were induced by an external stimulus. In plants grown under constant light with a temperature cycle, a rhythm was entrained in stomatal conductance but not in carbon assimilation, indicating that the oscillators driving the rhythms differed in their sensitivity to environmental stimuli.
1 This research was supported by National Science Foundation grant BSR 8717422 (C.B.F.) and a U.S. Department of Agriculture training grant to Stanford University (T.L.H.). This is CIWDPB Publication No. 1068.
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