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Plant and Cell Physiology, 1982, Vol. 23, No. 7 1291-1296
© 1982

Article

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

Osamu Tanaka1, Yutaka Nasu2, Atsushi Takimoto1 and Mamoru Kugimoto2

1Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan
2Department of Public Health, School of Medicine, Shinshu University Asahi, Matsumoto 390, Japan

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.

(Received June 7, 1982; Accepted August 27, 1982)
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