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Plant Physiology 82:28-33 (1986)
© 1986 American Society of Plant Biologists

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Articles

Photocontrol of Dark Circadian Rhythms in Stomata of Phaseolus vulgaris L

M. Geoffrey Holmes1 and William H. Klein

Smithsonian Environmental Research Center, 12441 Parklawn Drive, Rockville, Maryland 20852

Stomatal diffusion resistance in primary leaves of Phaseolus vulgaris L. which had been grown in light:dark cycles followed a marked circadian rhythm when the plants were transferred to continuous darkness. Reentrainment of the rhythm required more than one inductive change in photoperiod. The phasing of the rhythm of dark stomatal opening was contolled primarily by the light-on (dawn) signal, whereas the rhythm of dark closure was related to the light-off (dusk) signal. The evidence points to a dual control of the circadian clock in which a product of photosynthesis plays a major role. No evidence for phytochrome involvement in the phasing of the rhythm was found. An influence of phytochrome on the amplitude of the stomatal rhythm was observed in which removal of phytochrome-far-red absorbing form caused rapid damping.

1 Present address: M. G. Holmes, (Botany School, University of Cambridge, Downing Street, Cambridge CB2 3EA, U.K.)




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Copyright © 1986 by the American Society of Plant Biologists