Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 48:760-764 (1971)
© 1971 American Society of Plant Biologists

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Articles

Factors Affecting the Water-sensitive Phase of Flowering in the Short Day Plant Lemna perpusilla1

Ruth Halaban2 and William S. Hillman

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

The flowering of Lemna perpusilla strain 6746 is inhibited by daily transfers to water for short periods during a sensitive phase. Supplementing the water with Ca(NO3)2 partially reverses the inhibition of flowering while MgSO4 increases the inhibition. The inhibition by MgSO4 is overcome by low concentrations of Ca(NO3)2. Flower-promoting activity was detected in water and in MgSO4 solutions that had been incubated with plants under dark but not light conditions. The prevention of this effect by light appears to be photosynthetic rather than to depend on phytochrome. The activity is destroyed by autoclaving but not by brief boiling. This loss of a flower-promoting material may explain the inhibiting effect on flowering by transfers to water.

2 Present address: Department of Biological Sciences, State University of N.Y. at Albany, Albany, N.Y. 12203.

1 Research was 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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