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Evidence of Multiple Circadian Oscillators in Bean Plants

Carnegie Institution of Washington Department of Plant Biology, Stanford, California 94305, Department of Biological Sciences, Stanford University, Stanford, California 94305

Christopher B. Field

Carnegie Institution of Washington Department of Plant Biology, Stanford, California 94305

Circadian rhythms in stomatal opening and photosynthesis had shorter free-running periods than circadian rhythms in leaflet movement in bean plants (Phaseolus vulgaris L.) transferred from 12-hr photoperiods to constant conditions. The rhythm in leaflet movement had a period close to 27 hr, whereas the rhythm in stomatal opening, measured as conductance to water vapor, had a period close to 24 hr. Photosynthesis, measured as net assimilation of CO₂, also oscillated with a period close to 24 hr. The periods of these rhythms did not vary with increasing temperature, demonstrating temperature compensation of the controlling oscillators. The difference in free-running periods displayed by these rhythms is evidence that multiple oscillators with different intrinsic frequencies operate in bean plants.

Key Words: circadian rhythms • oscillators • leaflet movement • stomata • photosynthesis • Phaseolus

Journal of Biological Rhythms, Vol. 7, No. 2, 105-113 (1992)
DOI: 10.1177/074873049200700202


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