Abstract

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, α-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.

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