Measurement of Endogenous Phosphorus Levels in Relation to Flowering in the Long-Day Plant Lemna gibba G3

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When Lemna gibba G3 was grown on E medium, a decrease in the phosphate concentration caused a suppression of flowering and lead to a decrease in the phosphorus concentration in the plants. Addition of salicylic acid reversed this inhibition without causing an increase in the phosphorus concentration, while addition of copper or ammonium to Hoagland-type medium inhibited flowering, also without affecting the phosphorus concentration. Plants grown under 8 h or 24 h daylengths exhibited a FL% of 0 or about 50, respectively, but showed no difference in their phosphorus concentrations. These results indicate that a high phosphorus concentration is not always required for flowering in Lemna gibba G3. When plants were grown on a modified E medium in which 1/50 strength Hutner's medium micronutrients were substituted for the normal E medium micronutrients, the suppression of flowering caused by reduced phosphate was completely eliminated. Adding each micronutrient individually at the normal concentration to the modified E medium demonstrated that manganese inhibited flowering in modified E medium with a low phosphate concentration.
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