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Plant and Cell Physiology, 1979, Vol. 20, No. 1 267-270
© 1979

Short communication

Enhancement of long-day flowering by Mo-deficiency and application of some amino acids and asparagine in the short-day plant Lemna paucicostata 6746

Osamu Tanaka1, Atsushi Takimoto2 and Charles F. Cleland1

1Smithsonian Institution Radiation Biology Laboratory 12441 Parklawn Drive, Rockville, MD 20852, USA
2Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan

The short-day plant Lemna paucicostata 6746 can be induced to flower on long days (continuous light) by the addition of copper, tungstate or ferricyanide to the medium, and in each case the effect was greatly enhanced by deleting molybdate from the medium. Treatment with asparagine, aspartate, glutamate, {alpha}-alanine, glycine orserine, all of which are known to increase the critical daylength and almost nullify the light-break effect in L. paucicostata 6746, enhanced the long-day flowering induced by copper, ferricyanide or Mo-deficiency.

(Received October 13, 1978; )
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