Absorption of Copper by Lemna as Influenced by Some Factors Which Nullify the Copper Effect on Flowering and Growth

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Abstract
The effect of copper on flowering and growth of Lemna paucicostata 6746 and Lemna gibba G3 in a copper-containing medium is nullified by the addition of EDTA, ammonium ions or salicylic acid to the medium or a decrease in its nitrate concentration. These factors were examined for their effects on the absorption of copper by the plants. The addition of EDTA to the medium completely inhibited the absorption of copper in both species, thus eliminating the copper effect. Ammonium ions also inhibited copper absorption, their effectiveness rising with their concentration. Lowering the nitrate concentration in the medium nullified the copper effect on flowering in L. paucicostata 6746, and the addition of salicylic acid to the medium also nullified the copper effect in L. gibba G3, both without affecting the absorption of copper.