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Plant Physiology 46:641-644 (1970)
© 1970 American Society of Plant Biologists

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Articles

Response of Lemma perpusilla to Periodic Transfer to Distilled Water 1

Ruth Halaban and William S. Hillman

a Biology Department, Brookhaven National Laboratory, Upton, New York 11973

The flowering of Lemma perpusilla grown on half-strength Hutner's medium with sucrose under inductive photo-periods is inhibited in a periodic manner by daily transfers to water for short periods of time. The phase of maximal inhibition of flowering caused by water treatment is about 1 to 2 hours after the time of maximal sensitivity to light pulses. The rhythm of sensitivity to water treatments does not persist under continuous blue light. Supplementing the water with either Ca(NO3)2 or K2HPO4 partially reverses the inhibition of flowering, with the first salt being more effective. Supplementation with NH4NO3 or MgSO4 increases the inhibition. The water effect on flowering is not observed in plants grown on half-strength Hutner's medium without sucrose. The water treatments may act by removing or destroying a crucial precursor for photoperiodic induction, with the other conditions modifying permeability. The system provides a new technique for investigating the mechanism of photoperiodic induction.

1 Research carried out at Brookhaven National Laboratory under the auspices of the United States Atomic Energy Commission.




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W. S. Hillman
Calibrating Duckweeds: Light, Clocks, Metabolism, Flowering
Science, August 6, 1976; 193(4252): 453 - 458.
[Abstract] [PDF]


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Copyright © 1970 by the American Society of Plant Biologists